The Chemistry of Heteroarylphosphorus Compounds. Part 15. Phosphorus-31 Nuclear Magnetic Resonance Studies of the Donor Properties of Heteroarylphosphines towards Selenium and Platinum(II)

Article abstract of DOI:10.1039/DT9820000051

The donor properties of a series of heteroarylphosphines (bearing 2- and 3-furyl, 2- and 3-thienyl, and 1-methylpyrrol-2-yl groups directly bound to phosphorus) towards selenium and platinum(II) acceptors have been investigated by 31P n.m.r. studies of the one-bond coupling constants ¹J(77Se-31P) and ¹J(195Pt-31P).It is shown that the respective coupling constants increase as the heteroaryl groups become more electron withdrawing, indicating an increased s character for the phosphorus lone pair.The implications of this for the relative donor properties of the heteroarylphosphines and PPh3 are considered.