“…ppm respectively, confirming the disproportionation. [38] In the presence of NAC, the signal of compound 3 shows loss of CN -trans to the phosphine, being consistent with the 31 P NMR data. A small amount of the [Au(CN) 2 ] -is still present, suggesting that this is a less reactive species than compound 3 whose signals disappear first.…”
“…ppm respectively, confirming the disproportionation. [38] In the presence of NAC, the signal of compound 3 shows loss of CN -trans to the phosphine, being consistent with the 31 P NMR data. A small amount of the [Au(CN) 2 ] -is still present, suggesting that this is a less reactive species than compound 3 whose signals disappear first.…”
“…Me 3 P was obtained from Strem Chemical Co. All the selenones were synthesized according to the procedure described in the literature [9,10]. Me 3 PAuCl was prepared as described earlier [11].…”
Section: Chemicalsmentioning
confidence: 99%
“…However, the cyclic selenone studied here indicates that the propyl substituent such as [Me 3 PAuPrImSe]Cl forms a stronger complex compared to the methyl and ethyl substituents containing complexes. This could be due to the steric effect and more electron donation from Se to gold(I) forming a more stable Au-Se complex [11].…”
Section: H-nmr Studiesmentioning
confidence: 99%
“…The donation of electron density by selenones to gold(I) increases back donation from gold(I) towards phosphine, which increases the double bond character of the Au-P bond, resulting in a deshielding effect at the phosphorus atom. The smallest shift in [Me 3 PAuMeImSe]Cl suggests that MeImSe is the least basic among these ligands [11].…”
Mixed ligand complexes of gold(I) with various selenones and Me 3 P, [Me 3 PAuSe=C<]Cl, have been prepared and characterized by elemental analyses, i.r. and n.m.r. methods. A decrease in the i.r. frequency of the >C=Se mode of selenones upon complexation is indicative of selenone binding to gold(I) via a selenone group. An upfield shift in 13 C-n.m.r. for the >C=Se resonance of selenones and downfield shifts in 31 P-n.m.r. for Me 3 P moiety are consistent with the selenium coordination to gold(I). The steric effect as well as the basicity of Me 3 PAu + plays a significant role in bonding with Se-containing ligands compared to the Et 3 PAu + and Ph 3 PAu + complexes.
“…All the selenones were synthesized according to the procedure described in the literature [12,13]. Ph 3 PAuCl was prepared by adding Ph 3 P to a slurry of Me 2 S-AuCl in Me 2 CO under N 2 with stirring for 30 min [14].…”
A number of mixed ligand complexes of gold(I) with various selenones and Ph 3 P, [Ph 3 PAuSe@C<]Cl have been prepared and characterized by elemental analyses, i.r. and n.m.r. methods. A decrease in the i.r. frequency of the C@Se mode of selenones upon complexation is indicative of gold(I) binding via a selenone group. An upfield shift in the 13 C-n.m.r. for the C@Se resonance of selenones and downfield shifts in 31 P-n.m.r. for the Ph 3 P moiety are consistent with the selenium coordination to gold(I). Available data in the literature suggest that PAAuASe type complexes are usually linear.
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