Browsing by Author "N. singhal"

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Preparation, Spectroscopic Characterization and Solid State Electrical Conductance of Bimetallic Salts of the Type [M(L-L)3]2+[M(Ded)2]2-
(1995) N. singhal; L.B. Prastawa; R. Verma
Complex heterobiraetallic salts of the formula [m(l-l)3] [m1 (DED^] Lm = Zn(II), Ni(Il), Co(II), Cd(II), Fe(II); Mt = Ni(II), Zn(ll), Cd(ll); L-L = 2,2’-bipyridyl (bipy); 1,10-phenanthroline (o-phen) or ethylenediamine (en); DED = l,l-dicarboethoxy-2,2-ethylene dithiolatej have been obtained by the reaction of (Bu^N)2[Ni(DED)2] or (Et4N)2[Ml(DED)2] [M‘ = Zn(II), Cd(ll)] with the complex cations [m(l-l)3]2+. The measured conductivities are inconsistent with those expected for 2:2 electrolytes suggesting that extensive ion pairing is occurring between the highly charged cationic and anionic species in nitrobenzene. Magnetic moments, together with UV-visible spectra, are indicative of octahedral geometry around Fe(II), Co(ll) or Ni(ll) in the complex cation [m(l-l)3]2+ without any alteration in the planar NiS^ chromophore of LNi(DED)2J2”. The IR data indicate symmetrical bidentate behaviour of the DED moiety, £-phen, bipy or ethylenediamine. The bimetallic salts LM(L-LLM1 (DED J show semiconducting behavioural in the solid state with an electrical conductivity of 1.39 x 10“- 8.91 x 10 6 (ohm cm)“ Lower electrical conductivity rules out molecular interaction among cationic and anionic species through sulfur-sulfur stacking. © 1995, Taylor & Francis Group, LLC. All rights reserved.