Structure of Ba Na Ethylenediaminetetraacetatocobaltate(III) Perchlorate,Na[Ba_6(H_2O)_(25)][Co(Edta)]_4(C1O_4)_9 centre dot 5H_2O

摘要

Crystals with uncommon composition NaBa_6[Co(Edta)]_4(C1O_4)_9 centre dot 30H_2O (Edta~(4-) is ethylenedi-aminetetraacetic acid anion) were obtained with the following unit cell parameters:a=14.8513(9) A,b=26.2361(15) A,c=15.1789(9) A,a=91.661(7)~(deg),beta=113.035(7)~(deg),gamma=89.897(7)~(deg),space group PI.Each complex anion [Co(Edta)]~-is bonded through the carboxyl O atoms to five Ba atoms to give three-dimensional framework in a crystal.One perchlorate ion forms Ba-O-Cl-O-Ba bridge between the Ba atoms;four ClO_4~- ions are isolated,while the remaining four ions act as monodentate ligands at the Ba atoms.The water molecules (25 in sum) complete the coordination sphere of the Ba atoms to eight-,nine-,or ten-vertex polyhedron.Four water molecules are in the closest surrounding of the Na atom,one H_2O molecule is isolated.