Indian Journal of Chemistry

Sect. A: Inorganic, Bio-inorganic, Physical, Theoretical & Analytical

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VOLUME 45A

NUMBER 9

September 2006

CONTENTS

Rapid Communication

 

1977

 

Assessing the distribution of π-electrons into rings of phenylenes

 

 

 

 

Boris Furtula & Ivan Gutman*

 

 

 

A novel method for assessing the distribution of
π-electrons into rings of phenylenes is proposed. The method is equivalent to, but significantly simpler than, the original approach of Randić and Balaban.

 

Papers

 

1981

 

Structure investigation of 2-hydroxy ethyl methacrylate and styrene copolymers by NMR spectroscopy

 

 

 

 

 

 

 

 

A S Brara, Sunita Hooda & Ashok Kumar Goyal

 

 

 

2-Hydroxy ethyl methacrylate-co-styrene copolymers have been prepared by free radical bulk polymerization at 70°C. The reactivity ratios of the copolymers from Kelon Tudos and errors in variables method are found to be rH = 0.64 ± 0.22, r­­S­ = 0.41 ± 0.09 and rH = 0.62, r­­S­ = 0.40, respectively. The carbonyl and methyl carbon of H-unit and methine, quaternary carbon of S-unit have been assigned up to triad compositional sequence, whereas methylene carbon resonances have been assigned up to diad compositional level.

 

 

 

1988

 

Synthesis and structural characterisation of two Mn(II) complexes with 2,4,6-tris(2-pyridyl)-1,3,5-triazine ligand: Effect of weak interactions in their packing diagrams

 

 

 

Anamika Das, Guillaume Pilet & Samiran Mitra*

 

 

 

Two neutral monomeric complexes of [Mn(tptz)(NO3) (Cl)(H2O)]·0.5H2O 1, and [Mn(tptz) (NCS)2(H2O)] 2 {tptz = 2,4,6-tris(2-pyridyl)-1,3,5-triazine} have been synthesized and structurally characterized. The structural analysis reveals that the nitrate anion is linked to Mn(II) as bidentate ligand in 1 and two thiocyanate anions are linked to metal ion through N-atoms in 2.

 

 

1994

 

Cu K-absorption near edge studies on diethylenetriamine mixed ligand copper(II) complexes in solid state and in aqueous solution

 

 

 

 

 

 

 

 

 

S K Joshi*, P K Sharma, B D Shrivastava,
A Mishra & K B Pandeya

 

 

 

Cu K-absorption near edge structure studies of some copper(II) mixed ligand complexes involving the primary ligand diethylenetriamine and the secondary ligands imidazole, methyl imidazole and ethyl imidazole are reported. The chemical shifts are larger in the solid state as compared to the corresponding values in the aqueous solution, indicating more ionic nature of the complexes in solid state. Further, in the solid state, there is no splitting of the K-absorption edge, whereas in the aqueous solution, the K-edge splits into K1 and K2 edges showing that octahedral geometry in the solid form gets distorted in the solution form.

 

 

1999


Antifertility and antimicrobial activities of palladium and platinum complexes of 6-nitro-3-(indolin-2-one) hydrazine carbothioamide and
6-nitro-3-(indolin-2-one)hydrazinecarboxamide

 

 

 

 

 

Mukesh Kumar Biyala, Nighat Fahmi &
R V Singh*

 

 

 

 

2006


Synthesis and characterization of ternary carboxylato complexes of cobalt(II) with Schiff bases

 

 

 

 

 

 

 

 

 

 

Balram Prasad Baranwal *, Atresh Kumar Singh, Talat Fatma & Tarkeshwar Gupta

 

 

 

 

2011

 

Surface modification of granular activated carbon by nitric acid for the enhancement of copper adsorption

 

 

 

 

 

 

 

 

D Satapathy* & G S Natarajan

 

 

 

Concentrated nitric acid has been used for modifying surface of commercial grade carbon, Filtrasorb-400. Scavenging of copper ions from aqueous solutions onto both raw as well as modified granular activated carbon has been carried out. Equilibrium results show that surface modification increases the copper ion adsorption by 125% in comparison to that of raw granular activated carbon. FTIR spectra suggest that oxidation of granular activated carbon by nitric acid results in the formation of several functional groups at the carbon surface. Surface modification with nitric acid enhances the copper adsorption and helps in regeneration of carbon.

 

 

Notes

 

2017

 

Synthesis and characterization of titania nanoparticles by microemulsion process

 

 

 

 

 

 

 

 

 

 

 

Ping Lin, Chun-ying Xian, Zhi-ping Mao,
Quan Zhu, Xiao-li Chen & Li-min Zheng*

 

 

 

Titania nanoparticles have been prepared by microemulsion process with titanium chloride and aqueous ammonia in Triton X-100/n-butyl alcohol/cyclohexane.

 

 

2021

 

Coenzyme B12 model studies: Electronic and steric trans effects of cobaloximes

 

 

 

 

N Navaneetha & S Satyanarayana

 

 

 

The equilibrium, kinetics and thermodynamic parameters of axial ligand substitution of cobaloximes by –CONH2 and
–CSNH2 containing molecules in three different cobaloximes are reported. It has been found that the incoming ligand substitutes the coordinated water molecule trans to the alkyl group. The stability of the alkyl (aquo) cobaloximes has been explained on the basis of pKa, basicity and steric influence of the incoming ligand.

 

 

2026

 

Electromotive force studies associated with the binding of two cationic surfactants and their mixture to poly (ethylene glycol), poly (vinyl alcohol) and (vinyl acetate - ethylene) copolymer

 

 

 

 

Sayed Mehdi Ghoreishi*, Mohsen Behpour & Forogh Ebrahimi

 

 

 

Electromotive force measurements of the cationic surfactants, tetradecylpyridinium bromide and hexadecyltrimethylammonium bromide and their mixture in absence and presence of two nonionic polymers, poly(ethylene glycol), poly(vinyl alcohol), and one nonionic copolymer, vinyl acetate – ethylene, are reported here. The polymer / surfactant complexes exist for those polymers whose microstructures contain side groups with hydrophobic character. The data show the presence of interaction between mixed micelles and the neutral polymers.

 

2031

 

Viscosity behaviour of poly(caprolacton-dimethyl methacrylate)/poly(ethylene glycol) blends in various solvents

 

 

 

 

Sevil Savaskan Yilmaz*, Dilek Kul, Asu Usta,
Temel Öztürk & Murat Mısır

 

 

 

Viscosity behaviour has been studied for poly(caprolacton-dimethyl methacrylate), poly(ethylene glycol) and their blends (50:50) in tetrahydrofuran, N,N′-dimethyl formamide and chloroform at 25ºC. The blends have been characterized to evaluate their compatibility during the viscosity measurements. The influence of solvent upon the viscosity of dilute solutions of the blends has also been investigated.

 

 

2035

 

Synthesis and luminescence spectral properties of europium (III) and terbium (III) complexes with a new Schiff base ligand N,N¢,N¢¢-tri-(2,4-dihydroxyl acetophenone)-triaminotriethylamine

 

 

 

 

 

 

 

 

 

 

 

 

 

T L Yang* & W W Qin

 

 

 

A new Schiff base ligand with tripodal structure, N,N¢,N¢¢-tri-(2,4-dihydroxyl-acetophenone)-triaminotriethylamine, and its complexes with europium (III) and terbium (III), are described.

 

 

2040

 

Synthesis and characterization of cobalt (II) complexes of chromen-2-one-3-carboxy hydrazide and 2-(chromen-2'-onyl)-5-(aryl) 1,3,4-oxadiazole derivatives

 

 

 

Glory Mathew*, M S Suseelan & R Krishnan

 

 

 

Cobalt(II) complexes of chromen-2-one-3-carboxy hydrazide and 2-(chromen 2'-onyl)-5-(aryl)-1,3,4-oxadiazole derivatives are reported. All the Co(II) complexes exhibit the composition M(Ln)2X. The N,O donor ligands act as a bidentate ligand in all the complexes. Distorted octahedral geometry for all the Co(II) complexes is proposed.

 

 

2045

 

Cellulose acetate based thorium(IV) phosphate as a new and novel hybrid fibrous cation exchanger: Synthesis, characterization and thermal analysis

 

 

 

K G Varshney*, M Drabik & Arun Agrawal

 

 

 

Cellulose acetate based thorium(IV) phosphate has been synthesized as a new phase of hybrid fibrous cation exchanger by mixing thorium nitrate, phosphoric acid and cellulose acetate. It has been characterized by using IR, TGA, XRD and SEM in addition to its ion exchange capacity, elution, concentration and pH titration.

 

 

2048

 

Announcement

 

 

 

 

Authors for correspondence are indicated by (*)

 

 

Indian Journal of Chemistry

Vol. 45A, September 2006, pp. 1977-1980

 

Assessing the distribution of π-electrons into rings of phenylenes

Boris Furtula & Ivan Gutman*

Received 13 July 2006

We propose a novel method for assessing the distribution of π-electrons into rings of phenylenes. This method is equivalent to, but significantly simpler than, the original approach of Randić and Balaban.

Indian Journal of Chemistry

Vol. 45A, September 2006, pp. 1981-1987

 

Structure investigation of 2-hydroxy ethyl methacrylate and styrene copolymers by NMR spectroscopy

A S Brar, Sunita Hooda & Ashok Kumar Goyal

Received 10 May 2006; accepted 1 August 2006

2-Hydroxy ethyl methacrylate-co-styrene (H/S) copolymers have been prepared by free radical bulk polymerization at 70°C and their composition has been determined from their 1H NMR spectra. The reactivity ratios of H/S copolymers from Kelon Tudos and errors in Variables Method are found to be rH = 0.64 ± 0.22, r­­S­ = 0.41 ± 0.09 and rH = 0.62, r­­S­ = 0.40, respectively. 1H and 13C{1H} NMR spectra have been analyzed with the help of distortionless enhancement by polarization transfer (DEPT), 2D heteronuclear single quantum coherence (HSQC) and 2D total correlated spectroscopy (TOCSY). The carbonyl and methyl carbon of H-unit and methine, quaternary carbon of S-unit have been assigned up to triad compositional sequence, whereas methylene carbon resonances have been assigned up to diad compositional level.

IPC Code: Int. Cl.8 C08F212/08; C08F220/10; G01N24/00

 

Indian Journal of Chemistry

Vol. 45A, September 2006, pp. 1988-1993

 

Synthesis and structural characterisation of two Mn(II) complexes
with 2,4,6-tris(2-pyridyl)-1,3,5-triazine ligand: Effect of weak interactions in their packing diagrams

Anamika Das, Guillaume Pilet & Samiran Mitra *

Received 13 March 2006 ; revised 23 June 2006

Two neutral monomeric complexes of [Mn(tptz)(NO3)(Cl)(H2O)]·0.5H2O 1, [Mn(tptz) (NCS)2(H2O)] 2 {tptz = 2,4,6-tris(2-pyridyl)-1,3,5-triazine} have been synthesized and structurally characterized by single crystal X-ray diffraction and spectroscopic study. The structural analysis reveals that the nitrate anion is linked to Mn(II) as bidentate ligand in 1 and two thiocyanate anions are linked to metal ion through N-atoms in 2. The monomeric species of complexes 1 and 2 undergo
H-bonding resulting in supramolecular 1D and 2D architectures respectively.

IPC Code: Int. Cl.8: C07F13/00

 

Indian Journal of Chemistry

Vol. 45A, September 2006, pp. 1994-1998

Cu K-absorption near edge studies on diethylenetriamine mixed ligand copper(II) complexes in solid state and in aqueous solution

S K Joshi*, P K Sharma, B D Shrivastava, A Mishra & K B Pandeya

Received 25 April 2005; revised 22 June 2006

The Cu K-absorption near edge structure studies of some copper(II) mixed ligand complexes are reported here, involving the primary ligand diethylenetriamine (DETA) and the secondary ligands imidazole(Im), methyl imidazole (MIm) and ethyl imidazole (Elm). The studies have been made both in the solid as well as in the aqueous solution forms. The chemical shifts obtained for Cu K-absorption edge suggest that the entry of the secondary ligands into the coordination sphere affects the chemical shifts only slightly. The chemical shift values are larger in the solid state as compared to the corresponding values in the aqueous solution form indicating more ionic nature of the complexes in the solid state. Further in the solid state, there is no splitting of the K-absorption edge, whereas in the aqueous solution form the K-edge splits into K1 and K2 edges showing that the octahedral geometry in the solid form gets distorted in the solution form. The relative order of ionicity of the complexes in solid form is altered in solution form, which can be explained in terms of the changes in the geometry of the complexes on dissolution in water.

IPC Code: Int. Cl.8 C07F1/08; G01N23/00

 

Indian Journal of Chemistry

Vol. 45A, September 2006, pp. 1999-2005

 

 

Antifertility and antimicrobial activities of palladium and platinum complexes of 6-nitro-3-(indolin-2-one) hydrazine carbothioamide and 6-nitro-3-(indolin-2-one)hydrazinecarboxamide

Mukesh Kumar Biyala, Nighat Fahmi & R V Singh*

Received 23 February 2006; revised 10 July 2006

The reactions of palladium chloride and platinum chloride with monofunctional bidentate thiosemicarbazone (TSCZH) and semicarbazone (SCZH) derived from the condensation of 6-nitro-1H-indol-2,3-dione with thiosemicarbazide and semicarbazide hydrochloride, respectively, have been carried out in 1:2 molar ratios. The resulting derivatives of the type [M(TSCZH)2]Cl2 or [M(SCZH)2]Cl2 and [M(TSCZ)2] or [M(SCZ)2] (where M=PdII or PtII and TSCZ and SCZ=depro­tonated ligands) are coloured solids and monomeric in nature. Square planar geometry has been proposed for these complexes. The complexes have been characterized on the basis of elemental analyses, molecular weight determinations, magnetic susceptibility measurements and spectral studies including IR, 1H NMR, electronic spectra and X-ray diffraction studies. Antimicrobial effects of some representative ligands and their complexes on different species of pathogenic fungi and bacteria have been recorded. The antifertility activity of these compounds on male albino rats has also been performed.

IPC Code: Int. Cl.8 C07F15/00

 

Indian Journal of Chemistry

ol. 45A, September 2006, pp. 2006-2010

 

Synthesis and characterization of ternary carboxylato complexes of cobalt(II) with Schiff bases

Balram Prasad Baranwal *, Atresh Kumar Singh, Talat Fatma & Tarkeshwar Gupta

Received 2 December 2005; revised 2 May 2006

Some novel mixed-ligand, ternary carboxylato complexes of cobalt(II) with Schiff bases (HSB) having general formula [Co(OOCR)(SB)] (where R = C11H23, C13H27, C15H31 or C17H35) have been synthesized by the substitution reactions of anhydrous cobalt(II) acetate. The isolated products have been characterized by elemental analyses, molar conductance and magnetic moment measurements and spectral (infrared, electronic and FAB mass) data. Models and coordination hypotheses for the complexes have been proposed and a peculiar structural characterization has been discussed on the basis of physicochemical studies. A sharp structural change has been noticed.

IPC Code: Int. Cl.8 C07F15/06; C07C251/02

 

Indian Journal of Chemistry

Vol. 45A, September 2006, pp. 2011-2016

Surface modification of granular activated carbon by nitric acid for the enhancement of copper adsorption

D Satapathya,* & G S Natarajan

Received 28 October 2005; revised 11 July 2006

Concentrated nitric acid, a very powerful oxidizing agent, has been used for modifying surface of commercial grade carbon, Filtrasorb-400. Scavenging of copper ions from aqueous solutions onto both raw as well as modified granular activated carbon has been carried out. Equilibrium results show that surface modification increases the copper ion adsorption by 125% in comparison to that of raw granular activated carbon. FTIR spectra suggest that oxidation of granular activated carbon by nitric acid results in the formation of several functional groups at the carbon surface. The pH studies for both raw and oxidised granular activated carbon show that higher initial solution pH results in higher copper ion adsorption. The surface modification with nitric acid not only enhances the copper adsorption but also helps in regeneration of carbon.

IPC Code: Int. Cl.8 B01J20/20; C01B31/08

 

Indian Journal of Chemistry

Vol. 45A, September 2006, pp. 2017-2020

 

Synthesis and characterization of titania nanoparticles by microemulsion process

Ping Lin, Chun-ying Xian, Zhi-ping Mao, Quan Zhu Xiao-li Chen & Li-min Zheng*

 

Received 24 August 2005; revised 18 May 2006

Titania nanoparticles have been prepared by microemulsion process with titanium chloride and aqueous ammonia in Triton X-100/n-butyl alcohol/cyclohexane. The hydrated TiO2, precursor of titania nanoparticles, has been obtained via fusion and redispersion processes. Particle size of the hydrated TiO2 increases with increase in reaction time as well as surfactant-to-water molar ratio. Hydrated TiO2 has been calcined at 650°C and 1000°C and characterised by UV-VIS, TGA, DTA, XRD and TEM analyses. TGA and DTA show that amorphism is first transformed into anatase phase at 550°C and the anatase phase is converted into the rutile phase at 900°C. XRD and TEM results demonstrate that the anatase and rutile TiO2 nanoparticles possess better dispersity, with particle size 20~35nm and 40~60nm respectively.

IPC Code: Int. Cl.8 B01F3/08; B82B3/00

 

Indian Journal of Chemistry

Vol. 45A, September 2006, pp. 2021-2025

 

Coenzyme B12 model studies: Electronic and steric trans effects of cobaloximes

N Navaneetha & S Satyanarayana*

Received 5 January 2006; revised 15 June 2006

The equilibrium, kinetics and thermodynamic parameters of axial ligand substitution of cobaloximes by –CONH2 and–CSNH2 containing molecules in three different cobaloximes viz., trans RCo(DH)2H2O where DH = mono anion of dimethyl glyoxime and R = CH3, CH2I and CH2Br have been studied as a function of pH, incoming ligand concentration and temperature. It has been found that the incoming ligand substitutes the coordinated water molecule trans to the alkyl group with equilibrium constants that follow the order of stability: CH2Br > CH2I > CH3. Rate and activation parameters enable the formulation of the reaction mechanism that can account for the substitution reaction of the investigated cobaloximes. The stability of the alkyl (aquo) cobaloximes has been explained on the basis of pKa, basicity and steric influence of the incoming ligand.Alkyl cobaloximes are interesting compounds not only due to their analogies with organo cobalamins but also for their extensive coordination chemistry1-6. For these complexes the kinetics of substitution of the axial ligand L has been extensively studied. It has been shown that the nature of the alkyl group (R) significantly affects the substitution rate of the labile trans group, i.e., as the electron donating ability of the R group increases the rate constant also increases.

Indian Journal Chemistry

Vol. 45A, September 2006, pp. 2026-2030

 

Electromotive force studies associated with the binding of two cationic surfactants and their mixture to poly (ethylene glycol), poly (vinyl alcohol) and (vinyl acetate-ethylene) copolymer

Sayed Mehdi Ghoreishi*, Mohsen Behpour & Forogh Ebrahimi

Received 12 May 2006; revised 4 July 2006

Electromotive Force (EMF) measurements of the cationic surfactants, tetradecylpyridinium bromide (TPyB) and hexadecyltrimethylammonium bromide (HTAB) and their mixture in absence and presence of two non-ionic polymers, poly(ethylene glycol) (PEG), poly(vinyl alcohol) (PVA), and one non-ionic copolymer, vinyl acetate-ethylene (Sok), are reported here. The polymer/surfactant complexes exist for those polymers whose microstructures contain side groups with hydrophobic character. EMF curves for mixed surfactant systems show two breaks, C1 and C2 corresponding to two aggregation processes that is mainly attributed to structural transition of mixed micelles at C1 with a further increase in surfactant concentration. The data also show the presence of interaction between mixed micelles and the neutral polymers.

Indian Journal of Chemistry

Vol. 45A, September 2006, pp. 2031-2034

 

Viscosity behaviour of poly(caprolacton-dimethyl methacrylate) / poly(ethylene glycol) blends in various solvents

Sevil Savaskan Yilmaz *, Dilek Kul, Asu Usta, Temel Öztürk & Murat Mısır

Received 2 June 2005; accepted 11 July 2006

Viscosity behaviour has been studied for poly(caprolacton-dimethyl methacrylate) (PCL-DM), poly(ethylene glycol) (PEG) and the blends (50:50) of PCL-DM/PEG in tetrahydrofuran (THF), N,N′-dimethyl formamide (DMF), and chloroform (CHCl3) at 25ºC. The blends have been characterized to evaluate their compatibility during the viscosity measurements. The influence of solvent upon the viscosity of dilute solutions of PCL-DM/PEG blends has also been investigated.

IPC Code: Int. Cl.8 G01N11/00

Indian Journal of Chemistry

Vol. 45A, September 2006, pp. 2035-2039

 

Synthesis and luminescence spectral properties of europium (III) and terbium (III) complexes with a new Schiff base ligand N,N¢,N¢¢-tri-(2,4-dihydroxyl-acetophenone)-triaminotriethylamine

T L Yang* & W W Qin

Received 27 January 2006; revised 17 May 2006

A new Schiff base ligand with tripodal structure, N,N¢,N¢¢-tri-(2,4-dihydroxyl-acetophenone)-triaminotriethylamine (H6L), and its complexes with europium (III) and terbium (III) have been synthesized. The complexes have been characterized by element analysis, IR spectra, mass spectra, thermal analysis and molar conductivity. The europium (III) and terbium (III) cations coordinate with the Schiff base nitrogen atoms, the bridgehead nitrogen atoms and phenolic hydroxyl oxygen atoms of the ligand. The luminescence properties of the complexes in DMSO, THF, DMF, MeCN and CH3OH solvents have also been investigated. Under the excitation of UV light, these complexes exhibit characteristic of europium (III) and terbium (III). The solvent factors influencing the luminescence intensity are also discussed. Tentative structures for the complexes have been proposed based on the experimental results.

IPC Code: Int. Cl.8 C07C251/02

 

Indian Journal of Chemistry

Vol. 45A, September 2006, pp. 2040-2044

Synthesis and characterization of cobalt (II) complexes of chromen-2-one-3-carboxy hydrazide and 2-(chromen-2'-onyl)-5-(aryl) 1,3,4-oxadiazole derivatives

Glory Mathew*, M S Suseelan & R Krishnan

 

Received 30 December 2005; revised 17 July 2006

Cobalt(II) complexes of chromen-2-one-3-carboxy hydrazide and 2-(chromen 2'-onyl)-5-(aryl)-1,3,4-oxadiazole derivatives have been synthesized and characterized by elemental analysis, magnetic susceptibility, molar conductance, spectral studies [IR, UV-vis, and 1H NMR]. All the Co(II) complexes exhibit the composition M(Ln)2X2; where M = Co(II), L1 is chromen-2-one-3-carboxy hydrazide, L2 is 2-(chromen-2'-onyl)-5-(2"-hydroxylphenyl)1,3,4-oxadiazole,L3,2-(chromen-2'-onyl)-5-(4"-nitrophenyl) 1,3,4-oxadiazole and L4 is 2-(chromen-2'-onyl)-5-(4"-chlorophenyl)1,3,4-oxadiazole. X = Cl-, Br-, NO3-, CH3COO-, ClO4-, CNS-, SO4--. The N,O donor ligands act as a bidentate ligand in all the complexes. Distorted octahedral geometry for all the Co(II) complexes is proposed. X-ray structure determination has been made for the exact definition of the coordination sphere. The newly synthesized Co(II) complexes have been screened for their antimicrobial activity against some bacterial species like E. coli, S. aureus, Pseudomonas aeruginosa and few fungal strains, C. albicans and Cryptococcus neoformans.

 

IPC Code: Int. Cl.8 C07F15/06

 

Indian Journal of Chemistry

Vol. 45A, September 2006, pp. 2045-2047

 

Cellulose acetate based thorium(IV) phosphate as a new and novel hybrid fibrous cation exchanger: Synthesis, characterization and thermal analysis

 

K G Varshney*, M Drabik & Arun Agrawal

 

Received 4 February 2006; revised 24 June 2006

Cellulose acetate based thorium(IV) phosphate (CAThP) has been synthesized as a new phase of hybrid fibrous cation exchanger by mixing thorium nitrate, phosphoric acid and cellulose acetate in different proportions to obtain a material of optimum ion exchange properties. It has been characterized by using IR, TGA, XRD and SEM studies in addition to its ion exchange capacity, elution, concentration and pH titration. Extensive thermogravimetric studies have been performed to evaluate the behaviour of the material and its tentative structure.

IPC Code: Int. Cl.8 B01J39/00