Synthesis and X-ray crystal structures of tetraalkyl diphosphine complexes of silver(I), [Ag2 {Bu2tP(CH2)3PBi2t}2][BF4]2 · 2 CH2Cl2 and [Ag2 {Bu2tP(CH2)2PBu2t}(H2O)2][BF4]2
摘要:
The title complexes [Ag-2(dbpp)(2)](BF4)(2) (1) and [Ag-2(dbpe)(H2O)(2)](BF4)(2) (2), obtained as unexpected by-products while using AgBF4 to eliminate Cl- from rhodium complexes, were isolated and characterised by single-crystal X-ray diffraction. 1 was also prepared directly. The Ag atoms are bridged by two (1) or one (2) diphosphine ligands and have a linear P, P or P, H2O coordination. According to the P-31{H-1} spectra, the cation of 1 retains this structure in solution. Weak Ag ... F interactions with anions (in 2 'supported' by OH ... F hydrogen bonds) form two additional interaction bridges in 1 or link the Ag atoms in a catena-fashion in 2 and complement the Ag-I coordination to a trigonal-bipyramidal arrangement(with one equatorial site void). (C) 1997 Elsevier Science Ltd.