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  • 1
    Electronic Resource
    Electronic Resource
    Raman spectra of some complexes containing methyl-, dimethyl- and trimethyl-halophosphonium cations (1988)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 19 (1988), S. 91-99 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Vibrational assignments for the skeletal modes of the solid-state species (CH3)nPX5-n (X = Cl, Br; 1 ≤ n ≤ 3) have been made on the basis of their Raman Spectra. The results are consistent with ionic formulations (CH3)nPX4-n +X- and are compared with any previously available data. Two modifications of (CH3)2PCl2 +Cl- have been observed for the first time and their relative stabilities investigated. Raman spectra of the mixed halogen cationic compounds CH3PCl2Br+X-, CH3PClBr2 +X- and (CH3)2PClBr +X- are also reported and Lewis acid complexes of all the phosphonium cations show characteristic high-frequency shifts in the P—X stretching modes [relative to those in (CH3) RPX4-n +X-] which are rationalized in terms of anion-cation interactions. CH3PCl4 has been observed in a molecular form and the transition to the ionic modification (at ca 160 K) has been monitored by variable temperature Raman spectroscopy.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250190205
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  • 2
    Electronic Resource
    Electronic Resource
    Raman spectra of some complexes containing methyldihalo- and dimethylhalo-sulphonium cations: Isomerism in the dimethyl sulphide-bromine complex (1991)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 22 (1991), S. 265-274 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Vibrational assignments for the skeletal modes of some complexes containing CH3SX2+ and (CH3)2SX+ (X = Cl, Br) have been made on the basis of their solid-state Raman spectra and compared with any previous data. The stabilities of the parent CH3SX3 and (CH3)2SX2 compounds are discussed; two isomers of (CH3)2SBr2 were obtained under varying reaction conditions and assigned as ionic [(CH3)2SBr+Br-] and charge-transfer [(CH3)2S → Br2] forms. The transition of the ionic (metastable) form to the more stable charge-transfer form was monitored by differential scanning calorimetry. High-frequency shifts occur in some fundamental modes of (CH3)2SBr+Br- when Br- is replaced with a polyatomic anion, analogous to those seen in halophosphonium complexes; this is rationalized in terms of anion-cation interaction.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250220506
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  • 3
    Electronic Resource
    Electronic Resource
    Raman spectra and isomerism of some chlorophenylphosphoranes (C6H5)nPCl5  -  n (1 ≤ n ≤ 3) and their lewis acid salts (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 26 (1995), S. 101-106 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Syntheses of stable and metastable isomers for each of the chlorophenylphosphoranes, PhPCl4, Ph2PCl3 and Ph3PCl2, together with some Lewis acid salts are described. Comparison of Raman spectra of the salts with one set of isomers suggests an ionic formulation [PhnPCl4 - n+] [Cl-] (1 ≤ n ≤ 3); correlation with spectra of Sb and As analogues of known structure suggest pseudo-trigonal bipyramidal (Ψtbp) structures for the other isomers. Thermodynamically stable isomers are ionic Ph3PCl+Cl-, Ψtbp Ph2PCl3 and Ψtbp PhPCl4. Vibrational Raman assignments for the skeletal modes are given for each of the isomers and some of their Lewis acid salts. Frequency shifts arising from non-bonded interactions in the ionic species are compared with those in the methyl-substituted analogues.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250260202
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