90149-67-0Relevant academic research and scientific papers
A tetraphosphorus chain as part of a P8-containing ligand. Synthesis and properties of the η4-phosphabutadiene cobalt complex [Co(Ph2PCH2P(Ph)2P4P(Ph) 2CH2PPh2)]BF4 and of its carbonyl derivatives {[Co(Ph2PCH2P(Ph)2P ...
Cecconi, Franco,Ghilardi, Carlo A.,Midollini, Stefano,Orlandini, Annabella
, p. 1766 - 1770 (2008/10/08)
Full title: A tetraphosphorus chain as part of a P8-containing ligand. Synthesis and properties of the η4-phosphabutadiene cobalt complex [Co(Ph2PCH2P(Ph)2P4P(Ph) 2CH2PPh2)]BF4 and of its carbonyl derivatives {[Co(Ph2PCH2P(Ph)2P4P(Ph) 2CH2PPh2)][Cr(CO)5] 2}BF4 and {[Co(Ph2PCH2P(Ph)2P4P(Ph) 2CH2PPh2)][W(CO)5]}Y (Y = BPh4, BF4). X-ray Crystal structure of [Co(Ph2PCH2P(Ph)2P4P(Ph) 2CH2PPh2)]BF4. Cobalt(II) tetrafluoroborate hexahydrate in the presence of bis(diphenylphosphino)methane, dppm, reacts with white phosphorus to give the η4-phosphabutadiene cobalt complex [Co(Ph2PCH2P(Ph)2P4P(Ph) 2CH2PPh2)]BF4 (1) containing the tetraphosphorus zigzag chain (Formula Presented) A complete X-ray structure determination has been carried out. Crystal data for 1: a = 19.071 (7) A?, b = 26.712 (9) A?, c = 9.709 (4) A?, β= 93.92 (5)°, space group P21/n, Z = 4. Full-matrix least-squares refinement led to a conventional R factor of 0.063 for 4703 observed reflections. The cobalt atom is surrounded in a distorted octahedral fashion by the novel ligand Ph2PCH2P(Ph)2P4P(Ph) 2CH2PPh2, arising from the opening of the P4 molecule by the attack of two dppm ligands. The cobalt is coordinated to the four phosphorus atoms of the zigzag P-P-P-P fragment and to two of the four phosphorus atoms of the dppm ligands. In the reaction of 1 with hexacarbonyl derivatives, the heterometal complexes of formula {[Co(Ph2PCH2P(Ph)2P4P-(Ph) 2CH2PPh2)][Cr(CO)5] 2}BF4 (2) and {[Co(Ph2PCH2P(Ph)2P4P(Ph) 2CH2PPh2)][W(CO)5]}Y (Y = BPh4 (3) and Y = BF4 (4)) are formed. Crystals affording only a low-precision structure analysis for 3 have been obtained, the results of which are deposited in the supplementary material. This shows that one of the two central phosphorus atoms of the zigzag P-P-P-P chain is linked to the tungsten atom of a W(CO)5 fragment. The coordination geometry around the cobalt atom is essentially unchanged with respect to that of the starting complex 1.
