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Indian Journal of Chemistry

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

 

 

VOLUME 43A

NUMBER 3

MARCH 2004

 

 

CONTENTS

 

Rapid Communication

455

Design of neutral hydrocarbons having a planar tetracoordinate carbon

 

 

 

 

 

 

 

U Deva Priyakumar & G Narahari Sastry*

 

       

             

  A new bonding mode wherein the planar tetracoordinated arrangement is more stable than the tetrahedral form is proposed.

Papers

 458

Lyotropic liquid crystals formed in 3-dodecyloxy-2-hydroxypropyl trimethyl ammonium bromide--n-butanol--n-decane--water system

 

Lan-Ying Zhu, Xi-Lian Wei, Qing Sang, Bao-Lin Yin & De-Zhi Sun*

 

 

 

464

 

Model studies on segregation and catalytic properties of  supported Pt-Rh  nanocatalysts

 

Abir De Sarkar & Badal C Khanra*

 

 

Model investigations on the surface composition and catalytic activity of supported Pt-Rh nanocatalysts and their dependence on the impurity and the metal-support interactions have been presented. Monte-Carlo simulations indicate that sulphur can influence the surface composition very strongly; but the influence of metal-support interaction on the surface composition is insignificant.

 

473

 

Surface properties and catalytic activity for cyclohexanol decomposition of ceria loaded rutile and their sulphated analogues

 

J Babu, K R Sunajadevi & S Sugunan*

 

Ceria loaded rutile samples with different percentages of ceria and their sulphated analogues have been synthesized and characterized. Vapour phase decomposition of cyclohexanol performed over all the systems reveals that sulphation of the ceria loaded systems leads to selective catalysts for cyclohexene formation.

481

 UV/visible luminescence from photoproducts in infrared multiphoton dissociation of acrylonitrile

 

K K Pushpa, Awadhesh Kumar, P D Naik &

A V Sapre*

 

 Infrared multiphoton dissociation studies are reported  on acrylonitrile at pressures of ~ 10 torr by irradiation at
976 cm-1 by a TEA CO2 laser. The stable products on irradiation have been found to be H2, C2H2 and C2H4. With increased laser energy, the radical pathways compete with the molecular elimination channels leading to extensive decomposition of acrylonitrile.

 

487

 Poly(o-toluidine-co-o-chloroaniline) copolymers: Effect of polymerization conditions on the properties of the copolymers  

 

P Savitha & D N Sathyanarayana*

 

 Fully substituted polyaniline derivatives are synthesized by chemical copolymerization of o-toluidine with o-chloroaniline by three different methods to note the effect of synthesis conditions.and their structures determined. The copolymers are soluble in DMSO and their conductivities are generally higher than those of the homopolymers.

 494

Liquid membrane phenomena : Degree of coupling and electrokinetic energy conversion in liquid membranes generated by Triton X-100

  

Abhay K Jain*  & Jai P Upadhyay

 

 

.The transport coefficients of liquid membranes generated by triton X-100 in series array with a supporting membrane have been evaluated from the coefficients of total composite series membrane. The trends observed in resistance coefficients, degree of coupling and energy conversion corresponding to liquid membranes suggest that the liquid membranes generated at the interface are stabilized when ethylene glycol is added in the dispersion.

505

Viscosities and electrical conductances of some tetraalkylammonium and common ions in aqueous binary mixtures of N,N-dimethyl -acetamide  at 298.15K

 

 Debashis  Das & Dilip K Hazra*

 

Electrical  conductance measurements are reported for tetraalkylammonium bromides, sodium bromide and sodium tetraphenyl borate in binary mixture of  N,N-dimethylacetamide  and water. The  results have been interpreted considering  the selective solvation, size and structure forming effect of ions and also the movement of ions in a strongly hydrogen bonded solvent system.

 

511

Halogen oxidation of some diarylthiourea carbonyl complexes of chromium and molybdenum

 

 

A K Shrimal* , Amar Nath &

Amar Srivastava

 

Halogen oxidation of several sym-diarylthioureas (L), viz., sym-diphenylthiourea, sym-di-o-tolylthiourea), sym-di-o-anisidylthiourea and sym-di-a-naphthylthiourea  chromium and molybdenum carbonyls have been studied. The species isolated are heptacoordinated [(L)Mo(CO)4X2], hexacoordinated [(L)Cr(CO)4X]X and [(L)Cr(CO)3X2] (X = Br or I).

 

516

A  study on heterobimetallic chemistry of polyfunctional  bis(2-hydroxy-1-naphthaldehyde) malonoyldihydrazone: Dioxouranum(VI), dioxomolybdenum(VI), zinc(II), copper(II), nickel(II)  and  cobalt(II) complexes

 

 

R A Lal*, J Chakraborty, A Kumar,  S Bhaumik, R K Nath  & D  Ghosh

 

 

 

 

 

 

 Notes

527

NMR studies of  N - vinyl pyrrolidone / 4 - vinyl pyridine copolymers.

 

  

 

Sunita Hooda*, Rajeev Kumar & Manpreet Kaur

 

 N- Vinyl pyrrolidone / 4 - vinyl pyridine  copolymers of different composition have been prepared by free radical bulk polymerization using benzoyl peroxide as an initiator. The complete spectral assignment of 13C{1H}- NMR and 1H-NMR spectra has been done with the help of distortionless enhancement by polarization transfer and two dimensional heteronuclear single quantum coherence spectroscopy.

532

 Kinetics and mechanism of bromination of phenols by sodium bromate - sodium bisulphite reagent in water - acetonitrile mixture

 

J Viroopakshappa & V Jagannadham*

 

 

.

535

Synthesis and characterization of organogallium complexes derived from  2-(hydroxy)pyridine,
2-(hydroxy methyl)pyridine and 2-(2-hydroxy ethyl)pyridine

  

Nisha P Kushwah , Dimple P Dutta  & Vimal K Jain*

 

 R3Ga.Et2O  +  HO(CH2)nC5H4   

 

[R2Ga{O(CH2)nC5H4N}] + RH +  Et2O

 

R3Ga.Et2O  +  2HO(CH2)nC5H4N

 

[RGa{O(CH2)nC5H4N}2] + 2RH + Et2O 

539

Synthesis of phenylamino bis(dichlorophosphine oxide) and its complexes with group 12 metals

 

 Srinivasan Priya & Maravanji S Balakrishna*

 

 

 542

Dioxomolybdenum(VI) and dioxouranium(VI) complexes of tetradentate amidate ligands

   

Mannar R Maurya* & Neha Singh

 

 The ligands (LH2) obtained by the condensation of methylsalicylate and 1,2-diaminoethane, 1,2-diaminopropane or 1,3-diamino- propane  react with [MoO2(acac)2] or UO2(CH3COO)2 in 1:1 molar ratio in refluxing methanol to give complexes of the formula [MoO2L] and [UO2L. MeOH], respectively.

 548

 Synthesis, spectral and electrochemical studies on Fe (III) and  Mn (II) complexes with a tridentate ligand carrying pendant benzimidazolyl groups

 

 

Lata Nohria & Pavan Mathur*

 

 

                

 551

 Dinitrosylmolybdenum(0) complexes of catalytic and environmental relevance: A novel single step synthesis of dinitrosylmolybdenum(0) complexes of {Mo(NO)2}6* electron configuration involving biologically active 8-hydroxyquinoline- sulphonamides directly from molybdate(VI) and their characterization

 

R C Maurya*, A K Singh & S Rajput

 

 

 

 556

 Synthesis and physico-chemical studies on transition metal complexes of macrocyclic ligand derived from 2,6-diacetylpyridine dihydrazone

 

 Mohammad Shakir*, Poonam Chingsubam, Hamida-Tun-Nisa Chishti, Yasser Azim & Nishat Begum

 

 562

Synthesis and characterization of indole-3-acetates and indole-3-butyrates of Mo(VI) and W(VI)

 

Haq N Sheikh*, Ashaq Hussain, Madhu Sharma & Bansi L Kalsotra

 

 Reaction of indole-3-acetic acid and indole-3-butyric acid with MoO3 and WO3 in aqueous ammonia afford complexes of the type MO2(In-3-Ac)2 and MO2(In-3-Bu)2 (M=Mo or W) containing cis O=M=O bonds. Indole-3-carboxylates are coordinated to the metal ion in a symmetrical bidentate fashion through two oxygen atoms of carboxylate group.

566

 Synthesis and characterization of schiff base derivatives of bimetallic[Mg(II); Al(III)]-m-oxoisopropoxide

  

Harish K Sharma* & Pramesh N Kapoor

 

 

 

 569

Quinoline-8-thiol functionalized solid phase extractant for the preconcentration of ultratrace amounts of mercury(II)

 

Rosilind Mathew, A Maria starvin &T Prasada Rao*

 

 A solid material consisting of quinoline-8-thiol functionalized naphthalene provides a convenient, rapid and economical method for preconcentration of mercury. The mercury-quinoline-8-thiol complex is quantitatively retained on naphthalene in the pH range 5.0-7.0.

 573

 A facile spectrophotometric method for the determination of  hypochlorite  using  azure B

 

B Narayana*, K Vipin,  Mendalin Mathew & N V Sreekumara

 

 A simple, rapid and sensitive spectrophotometric method
has been developed for the determination of hypochlorite using azure B. The method is based on the reaction of hypochlorite with potassium iodide in acidic medium to liberate iodine. The method has been successfully applied to the determination of hypochlorite in some real samples.

 

 576

 Extractive spectrophotometric determination of molybdenum(VI) using 3-hydroxy-2-(4-methoxy phenyl)-6-propionyl-4H-chromen-4-one as a new reagent.

 

Rameshwar Dass*, Anil Kumar &   R G  Sharma

 

A sensitive spectrophotometric method has been developed for the determination of molybdenum(VI) using 3-hydroxy-2-(4-methoxyphenyl)-6-propionyl-4H hromen-4-one.The metal ion forms a yellow complex with the reagent in acetic acid medium. The method is simple, selective, precise and rapid and has been applied satisfactorily to the determination of molybdenum in various steels and a wide variety of synthetic samples.

 

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