Syntheses, crystal structures and spectroscopic characterization of [Co(phen) 2(gly)]Cl 2 · 4H 2O and [Co(phen) 2(H 2O) 2](NO 3) 3 · 2H 2O

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Two cobalt(III) complexes with phenanthroline, [Co(phen) 2(gly)]Cl 2 · 4H 2O ( 1) and [Co(phen) 2(H 2O) 2](NO 3) 3 · 2H 2O ( 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 Å, the bond distances of CoO = 1.919 Å (H 2O) are significantly longer than that of CoO = 1.884 Å (COO −). The complex 2 contains a crystallographic two-fold axis.