Optically active transition metal compounds, 116 - Bond lengths Co-C(CO), Co-N(NO) and angles L-Co-C(CO), L-Co-N(NO) in tetrahedral complexes

The bond lengths Co-C(CO), Co-N(NO) and angles L-Co-C(CO), L-Co-N(NO) in si x tetrahedral complexes. determined by X-ray crystallography, were analysed and compared with the calculated compound Co(CO)(2)(NO)PH3. Distinct diffe rences were found which allow a differentiation of the two similar ligands CO and NO. These differences are used to assign CO and NO Ligands in cases where this has not been possible before including a structure in which the two independent molecules in the unit cell are diastereomers. The relations hip seems to hold not only for tetrahedral compounds but also for other pol yhedral coordination types.