Mononuclear copper (II) salicylate imidazole complexes derived from copper(II) aspirinae.Crystalographic determination of three copper geometries in a unt cell

摘要

Complexes of the type Cu(Im)_n(sal)_2 (1,2,3) (where Im=imidazole,and sal=salicylate ion) have been prepared from the reaction of Im with tetrakis (aspirinato) dicopper (II) and were crystallographically and spectroscopically characterized.The three imidazole complexes 1(n=2),2(n=5) adn 3(n=6) co-crystallize and each complex is found in the unit cell.Crystals that contained 1,2 and 3 have unit cell parameters of a=12.772(5),b=13.078(4) and c= 18.199(7) A,#alpha#=79.53(3),#beta#=81.20(3) and #gamma#=75.98(3)deg and belong to the space group Pl.In 1 the copper ion is coordinated in a trans arrangement by two imidazole nitrogen atoms and two earboxylate oxygen atoms from the salicylate ligands.The second carboxylate atoms form weak interactions with the copper ion.For complex 2 the copper ion is in a distorted square pyramidal environment of nitrogen atoms from five imidazole ligands.There are two salicylate counterions.Complex 3 exists as tetragonally distorted octahedral copper(II) cation with six coordinated imidazole ligands and two salicylate counterions.