Geometrical and ground state electronic structures of nitrosylcobalt complexes (RNCHCHNR)Co(NO)(CO) (R = isopropyl, 2,6-diisopropylphenyl or p-tolyl) from experiment and DFT-calculations. Zeitschrift fuer Anorganische und Allgemeine Chemie, (628)11:2360--2364, 2002. [PUMA: DFT calcn cobalt complex complex;nitrosylcobalt crystal diazabutadiene electronic ground mol nitrosyl prepn state structure]