New Monocationic Trialkylphosphine Tetraphenylborate Salts

Abstract

Six new monocationic trialkylphosphines, [P(CH₂NH₂R){CH₂N(R)CH₂N(R)CH₂}]⁺ (R = C₆H₅CH₂, 4-FC₆H₄CH₂, 4-ClC₆H₄CH₂, 4-CH₃C₆H₄CH₂) as their Cl⁻ (1c, 1d) or BPh₄ ⁻ (2a−2d) salts, are described. All compounds have been characterized by ³¹P{¹H} spectroscopy, FTIR spectroscopy, and elemental analysis. A single crystal X-ray structure determination of 2a has been performed. In contrast to recent examples reported by us, only one intramolecular N−H···N hydrogen bond was observed in molecules of 2a; the other N‒H was involved in an N‒H···π intermolecular interaction to the BPh₄ ⁻ anion.

Keywords:

• Anion metathesis
• ligands
• spectroscopy
• tertiary phosphine
• X-ray crystallography

Acknowledgments

We would like to thank Niger Delta University, Bayelsa State, Nigeria, for funding (A.T.E.). Rhodia U.K. Ltd (Dr. Ranbir Padda) is gratefully acknowledged for the kind donation of THPC.