Synthesis and structures of two cobalt complexes [NaCo II (NTA)(H 2 O)] n and NH 4 [Co III (IDA) 2 ]  ·  2H 2 O.

Two cobalt complexes [NaCo II (nta)(H 2 O)] n (H 3 nta  =  nitrilotriacetic acid) (1) and NH 4 [Co III (ida) 2 ]  ·  2H 2 O (H 2 ida  =  iminodiacetic acid) (2) have been synthesized and characterized by single-crystal X-ray diffraction analysis. Compound 1 crystallizes in the orthorhombic system, space group P 2 1 2 1 2 1 with a   =  7.9770(12)  Å, b   =  9.7613(15)  Å, c   =  12.1945(18)  Å, V   =  949.5(2)  Å 3 , Z   =  4, and R 1   =  0.0705 for 1597 observed reflections. Compound 2 crystallizes in the monoclinic system, space group P 2(1)/ c with a   =  5.1801(3)  Å, b   =  11.2073(6)  Å, c   =  12.2891(7)  Å, V   =  707.09(7)  Å 3 , Z   =  2, and R 1   =  0.0349 for 1143 observed reflections. In compound 1, the Co is coordinated by a nitrogen and five oxygen atoms in a distorted octahedral geometry {CoNO 5 }, and the Na is coordinated by one water molecule and four carboxyl oxygen atoms in slightly distorted square pyramidal geometry. The entire structure shows a three-dimensional network. In compound 2, Co atom is equatorially coordinated by two ida ligands in a distorted octahedral geometry {CoN 2 O 4 }. The discrete [Co(ida) 2 ] 2- anions are linked by hydrogen bonding to a three-dimensional supramolecular network. [ABSTRACT FROM AUTHOR]