Tertiary phosphine abstraction from a platinum(II) coordination complex with SeCN: Crystal and molecular structures of SePTA and [SePTA-Me]I · CH3OH |
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Authors: | Stefanus Otto Adriana Ionescu |
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Affiliation: | a Department of Chemistry, University of the Free Sate, P.O. Box 339, Bloemfontein, 9300, South Africa b Organic Chemistry, Centre for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden |
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Abstract: | Reacting [PtCl(PTA)3]Cl(PTA = 1,3,5-triaza-7-phosphatricyclo[3.3.1.13,7]decane) with KSeCN in aqueous or MeOH medium results in the abstraction of the PTA ligands to yield Se PTA. The reaction also proceeds quantitatively by direct reaction of PTA and KSeCN in water or methanol. The methylated PTA ligand, [PTA-Me]I (1-methyl-1-azonia-3,5-diaza-7-phosphatricyclo[3.3.1.13,7]decane iodide), reacts accordingly with KSeCN, albeit significantly slower. The crystal structure of Se PTA, 1, and [Se PTA-Me]I · CH3OH, 2, revealed P Se bond distances of 2.0991(19) and 2.100(2) Å, respectively. The first order phosphorous selenium coupling constants, 1JP-Se (D2O), of 722 and 788 Hz for Se PTA and [Se PTA-Me]I, respectively, indicates the latter is significantly less electron rich. |
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Keywords: | PTA Phosphine selenides Crystal structures |
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