K. R. Koch, Oren Hallale, S. Bourne
Apr 12, 2001
Citations
0
Influential Citations
50
Citations
Journal
Journal of Molecular Structure
Abstract
Abstract The bipodal ligands 3,3,3′,3′-tetraethyl-1,1′-isophthaloylbis(thiourea), H 2 L 1 , and 3,3,3′,3′-tetra( n -butyl)-1,1′-isophthaloylbis(thiourea), H 2 L 2 , react with Ni(II) and Pd(II) to form exclusively 2:2 metallomacrocyclic cis -[Pd(L 2 - S , O )] 2 and cis -[Ni(L 1 - S , O )] 2 complexes in high yields. Purple-brown cis -[Ni(L 1 - S , O )] 2 readily form green adducts cis- [Ni(L 1 - S , O )(X) 2 ] 2 (X is pyridine or 4-dimethylaminopyridine), in which two X molecules are axially bound to each Ni(II) atom. Thermogravimetric analysis of these adducts shows that cis- [Ni(L 1 - S , O )(X) 2 ] 2 revert back to the planar cis -[Ni(L 1 - S , O )] 2 complexes on heating. The crystal structures of 3,3,3′,3′-tetraethyl-1,1′-isophthaloylbis(thiourea), cis -[Pd(L 2 - S , O )] 2 , cis- [Ni(L 1 - S , O )(pyridine) 2 ] 2 and cis- [Ni(L 1 - S , O )(4-dimethylamino-pyridine) 2 ] 2 are reported.