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Ahmad Saeed Isab Anvarhusein A. Perzanowski Herman P. Hussain M. Sakhawat Akhtar M. Naseem 《Transition Metal Chemistry》2002,27(2):177-183
Phosphine sulfides and their gold(I) complexes with general formula R3P=S—Au—X (X = Cl–, Br– or CN–) were prepared and characterized by elemental analyses, i.r. and 31P-n.m.r. spectroscopy. A decrease in the i.r. frequency of the P=S bond in the ligands upon complexation, is indicative of S coordination to gold (I). The 31P-n.m.r. spectra revealed that electronegativity of the substituents and angles between them were the two most important factors influencing the 31P-n.m.r. chemical shifts. The phosphorus resonance was observed to be more downfield in alkyl substituted phosphine sulfides as compared to the aryl substituted phosphine sulfides. Ligand scrambling in the Cy3P=S—Au—CN complex in solution, to form [(Cy3P=S)2Au]+ and [Au(CN)2]–, was investigated by 13C and 15N-n.m.r. spectroscopy. Equilibrium constants (K
eq) for scrambling of the Cy3P=S—Au—CN complex and for its analogue, Cy3P=Se—Au—CN were measured by integrating the 13C-n.m.r. at 297 K and were found to be 0.147 and 1.81 respectively. 相似文献
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P. Amade L. Chevelot Herman P. Perzanowski Paul J. Scheuer 《Helvetica chimica acta》1983,66(6):1672-1675
The structure of a colorless dimer ( 4a ) of puupehenone ( 1 ), which was isolated from Pacific marine sponges, has been elucidated from spectral data. 相似文献
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Ahmad Saeed Isab Anvarhusein A. Perzanowski Herman P. 《Transition Metal Chemistry》2002,27(7):782-785
AgI complexes of thiourea (tu) having the general formula Ag(tu)
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NO3 (x = 1–4) have been prepared and characterized by elemental analyses, i.r. and n.m.r. (1H, 13C, 15N and 107Ag) spectroscopy. Separate i.r. bands were observed for terminal and bridging tu ligands in the complexes. The Ag(tu)NO3 complex is assumed to be polymeric with all tu groups in the bridging mode. A consistent upfield shift in the 13C-n.m.r. chemical shift is observed as the number of tu groups attached to AgI increases, whereas the opposite trend is observed for 1H, 15N and 107Ag chemical shifts. 相似文献
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