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- W3136235991 abstract "Treatment of a methanol solution of Rh/sub 2/(CO)/sub 4/(..mu..-Cl)/sub 2/ with bis((dimethylphosphino)methyl)methylphosphine, dmmm, in dichloromethane followed by precipitation with sodium tetraphenylborate yields yellow (Rh/sub 2/(..mu..dmmm)/sub 2/(CO/sub 2/)(BPh/sub 4/)/sub 2/. The structure of this salt has been determined by X-ray crystallography. It crystallizes from acetone/ethylether in the orthorhombic space group Pn2/sup 1/m (bca of No. 31) with 2 molecules/unit cell of dimensions a = 11.590 (2), b = 12.516 (2), and c = 22.329 (4) A at 140 K. Least-squares refinement of 213 parameters using 2845 reflections yielded R = 0.057. the structure of the cation consists of a four-coordinate rhodium (terminal CO, two CH/sub 3/P(CH/sub 2/)/sub 2/, and the other Rh as ligands) connected to a six-coordinate rhodium (terminal CO, four CH/sub 2/P(CH/sub 3/)/sub 2/, and the other Rh as ligands (through a dative Rh-Rh bond, which is 2.777 (1) A long. The coordination about the six-coordinate rhodium is distorted so that one trans P-Rh-P units nearly linear (173.9 (2)/sup 0/) and the other is decidedly bent (146.1 (2)/sup 0/). This distortion is caused by the packing of the methyl and methylene carbons around the OC-Rh-Rh-CO unit. The /sup 31/P NMR spectrum is temperature-dependent. In acetone solution at -75 /supmore » 0/C the three phosphorus environments are clearly resolved while warming causes broadening and approach to coalescence of the two terminal phosphorus resonances. 28 references, 6 figures, 3 tables.« less" @default.
- W3136235991 created "2021-03-29" @default.
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- W3136235991 date "1986-06-17" @default.
- W3136235991 modified "2023-09-26" @default.
- W3136235991 title "ChemInform Abstract: Synthesis, Structure. and Structural Dynamics of a Remarkably Crowded Rhodium(I) Dimer: [Rh2((Me2PCH2)2PMe)2(CO)2][B(C6H5)4]2." @default.
- W3136235991 cites W2950581538 @default.
- W3136235991 doi "https://doi.org/10.1002/chin.198624275" @default.
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