SYNTHESES AND CRYSTAL STRUCTURES OF COBALT(II) COMPLEXES WITH PIPERAZINE-1,4-DIYLBIS(METHYLENE)BIS(PHOSPHINIC) ACID

摘要

The synthesis of compounds of piperazine-1,4-diylbis(methylene)bis(phosphinic) acid (H(2)L) (1) with Co-II is described and the X-ray structures of the isolated complexes [Co(H(2)L)(3)](ClO4)(2) . 2H(2)O (2) and [Co(H2O)(6)]L (3), have been determined. Compound 2 forms a three-dimensional polymeric network of cobalt atoms bridged by 1, which is monodentately coordinated to cobalt through the phosphinate groups.:The nitrogen atoms are protonated and non-coordinated. In 3, 1 is deprotonated and forms non-coordinated anions and the octahedral coordination sphere of the cobalt atoms consists of water molecules. [References: 16]