Syntheses, crystal structures and spectroscopic characterization of [Co(phen)2(gly)]Cl2 · 4H2O and [Co(phen)2(H2O)2](NO3)3 · 2H2O

Two cobalt(III) complexes with phenanthroline, [Co(phen)2(gly)]Cl2 · 4H2O (1) and [Co(phen)2(H2O)2](NO3)3 · 2H2O (2), (phen = phenanthroline and gly = glycine), were synthesized and characterized by IR and NMR spectra. Their structures were determined by single crystal X-ray diffraction techniques. The coordinated cations all contain a six-coordinated cobalt atom chelated by two phen ligands and one gly anion or two aqua ligands in cis arrangement. The CoN bond distances in the cations lie in the range 1.934–1.952 A, the bond distances of CoO = 1.919 A (H2O) are significantly longer than that of CoO = 1.884 A (COO−). The complex 2 contains a crystallographic two-fold axis.