Quantitative values of softness and structure of dimetallic tetrathiocyanate complexes
PP Singh, SA Khan, M Dubey, OP Agrawal - Inorganica Chimica Acta, 1979 - Elsevier
PP Singh, SA Khan, M Dubey, OP Agrawal
Inorganica Chimica Acta, 1979•ElsevierBimetallic tetrathiocyanate complexes of the type MM′(SCN) 4· xL [M= Ni (II), Co (II), Zn (II);
M′= Cd (II), Hg (II) and L= thiazolidinethione (tzt), thiohydantoin (thn), ethylenethiourea
(etu); x= 2, 4, 6] have been prepared and their structures have been proposed by elemental
analysis molar conductance, magnetic moment, infrared spectral, electronic spectral studies
quantitative values of softness. These studies indicate that the complexes are of two types:
cationic-anionic, viz.[ML x]++[Cd (SCN) 4]−−[M= Co (II), Ni (II); L= tzt, thn, etu; x= 4, 6] and …
M′= Cd (II), Hg (II) and L= thiazolidinethione (tzt), thiohydantoin (thn), ethylenethiourea
(etu); x= 2, 4, 6] have been prepared and their structures have been proposed by elemental
analysis molar conductance, magnetic moment, infrared spectral, electronic spectral studies
quantitative values of softness. These studies indicate that the complexes are of two types:
cationic-anionic, viz.[ML x]++[Cd (SCN) 4]−−[M= Co (II), Ni (II); L= tzt, thn, etu; x= 4, 6] and …
Abstract
Bimetallic tetrathiocyanate complexes of the type MM′ (SCN)4·xL [M = Ni(II), Co(II), Zn(II); M′ = Cd(II), Hg(II) and L = thiazolidinethione (tzt), thiohydantoin (thn), ethylenethiourea (etu); x = 2, 4, 6] have been prepared and their structures have been proposed by elemental analysis molar conductance, magnetic moment, infrared spectral, electronic spectral studies quantitative values of softness. These studies indicate that the complexes are of two types: cationic-anionic, viz. [MLx]++[Cd(SCN)4]− −[M = Co(II), Ni(II); L = tzt, thn, etu; x = 4, 6] and monomeric thiocyanate bridged viz.L2M(NCS)2Hg(SCN)2 [M = Zn, Co, Ni; L = tzt, etu, thn] and L4′Ni(NCS)2Hg(SCN)2 (L′ = etu, thn). Thiocarbonyl sulphur is the donor site in cationic-anionic complexes and imino nitrogen in bridged thiocyanate complexes in all three ligands. The relative strength of thiocyanate bridges have been correlated with the total softness difference ΔTEn‡ (MM′) which was calculated using Klopman's equation. Symmetry and group theoretical calculations have also been made to support the proposed structures.
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