Synthesis and structural studies of phosphorus carbonyl manganacycles containing the tetraphenyldiselenoimidodiphosphinato ligand

The [Mn(CO)4−x(L){Ph2P(Se)NP(Se)Ph2-κ2Se}] complexes, where x = 1 for L = PPh3 and PMePh2, and x = 2 for L = Ph2PCH2CH2PPh2 (diphos), were synthesized by two routes. The complexes were characterized by IR, mass spectrometry (FAB+), NMR (1H, 13C, 31P, 77Se) spectroscopy and/or single crystal X-ray diffraction. The X-ray diffraction analysis for [Mn(CO)3PMePh2{Ph2P(Se)NP(Se)Ph2-κ2Se}] showed that the unit cell contains two independent mononuclear molecules with different MnSePNPSe rings’ conformations.