A variable temperature ³¹P NMR study of 9-30 atom macrocylic rings of silver(I) with long chain diphosphines

Abstract

The coordination chemistry of equimolar amounts of silver(I) with the long chain diphosphine ligands Ph₂P(CH₂) _n PPh₂ (where n = 6, 8, 10, or 12) has been studied by variable temperature ³¹P{¹H} NMR. In all cases two silver(I)/diphosphine complexes were observed in solution at ambient temperature with ¹ J(¹⁰⁷Ag–P) values of ca 500 Hz indicating silver(I) coordinated to two phosphorus atoms in a linear mode. A van’t Hoff study on the variable temperature ³¹P{¹H} NMR data has been used to assign monomeric and dimeric species.

Keywords:

• Organophosphorus compounds
• Nuclear magnetic resonance
• Electrospray mass spectrometry
• Ag(I) complexes

Acknowledgements

We are grateful to Dr M. Seyedmonir (West Virginia State University) for his assistance with the standard errors.