Koordinationseigenschaften von Carbaboranylchlorophosphanen: Synthese und Molekülstruktur voncis-rac-Molybdäntetracarbonyl{1,2-bis(chlorophenylphosphino)-1,2-dicarba-closo-dodecaboran(12)}

Abstract

Coordination Properties of Carbaboranylchlorophosphines: Synthesis and Molecular Structure of cis‐rac‐Molybdenumtetracarbonyl{1,2‐bis(chlorophenylphosphino)‐1,2‐dicarba‐closo‐dodecaborane(12)} Rac‐1,2‐bis(chlorophenylphosphino)‐1,2‐dicarba‐closo‐dodecaborane(12) (1) reacts with [Mo(CO)4(NBD)] (NBD = norbornadiene) after several hours at 50–55 °C to yield cis‐rac‐[Mo(CO)4{1,2‐(PPhCl)2C2B10H10}] (2). 2 was characterised spectroscopically (1H, 13C, 11B and 31P NMR) and by crystal structure determination.

Chiral Rhodium(I) Complexes of 1,2‐Bis‐(chloroalkoxyphosphanyl)‐ and 1,2‐Bis‐(amidoalkoxyphosphanyl)‐1,2‐dicarba‐closo‐dodecaboranes(12)

“…This also causes a slight distortion of the octahedral environment of the molybdenum atom. The Mo−P bond lengths are in the range of those of previously reported 1,2‐bis(phosphanyl)‐1,2‐dicarba‐ closo ‐dodecaborane(12)‐molybdenum(0) complexes . The strong π‐acceptor and weak σ‐donor properties of the phosphanyl groups influence the π backbonding of the carbonyl groups.…”

12 Chromium, molybdenum and tungsten

“…186 rac-1,2-Bis(chlorophenylphosphino)-1,2-dicarba-closo-dodecaborane (12) reacts with [Mo(CO) 4 (nbd)] to give cis-rac-[Mo(CO) 4 {1,2-(PPhCl) 2 C 2 B 10 H 10 }], characterised by multinuclear NMR ( 1 H, 13 C, 11 B and 31 P) and X-ray crystallography. 187 In a Raman spectroscopic study of [MO 2 MeTp*] and [MO 2 MeCp*] (M Mo, W), and [WO 2 BuCp*] it was found that an observed characteristic shift of the metal^oxygen stretching frequency might be used as an indicator for the relative donor abilities of Cp* and Tp*. This proposal is supported by force ¢eld calculations.…”