- Reinvestigation of tricyclohexylphosphine complexes of zinc(II) and cadmium(II) halides. Preparation, characterization, and phosphorus-31 nuclear magnetic resonance and vibrational spectroscopic studies
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Zinc(II) halides form isolable 1:1 complexes with tricyclohexylphosphine. Previously reported 1:2 complexes, ZnX2[P(cy)3]2, are indicated to be ZnX2P(cy)3[OP(cy)3] by 31P{1H} NMR spectral measurements. Cadmium(II) halides form isolable 1:1 as well as 1:2 complexes with tricyclohexylphosphine. Molecular weight data show that the 1:1 complexes of both zinc(II) and cadmium(II) halides exist in solution as dimeric molecular species, M2X4[P(cy)3]2. The far-infrared and Raman spcectra for these complexes, in the solid state, are consistent with a dimeric structure of C2v skeletal symmetry. Vibrational spectra of the CdX2[P(cy)3]2 complexes, in the solid state, are consistent with a pseudotetrahedral structure of C2v skeletal symmetry. Phosphorus-31 NMR spectral measurements at 306 ± 2 K show that the 1:2 complexes, CdX2[P(cy)3]2, dissociate extensively in solution into the 1:1 complexes and P(cy)3; no such dissociation is evident at 213 K. Phosphorus-31 NMR spectra of the Zn2X4[P(cy)3]2 and Cd2X4[P(cy)3]2 complexes have also been examined at 306 ± 2 K and at 183 or 213 K.
- Goel, Ram G.,Henry, William P.,Jha, Narendra K.
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p. 2551 - 2555
(2008/10/08)
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