title: Intramolecular hydrogen-bonded tertiary phosphines as 1,3,5-triaza-7-phosphaadamantane (PTA) analogues.
abstract: New cationic trialkylphosphines [P(CH(2)NH(2)R){CH(2)N(R)CH(2)N(R)CH(2)}](+) (R = C(6)H(5)CH(2), a; 4-FC(6)H(4)CH(2), b), as their Cl(-) (1a, 1b), SbF(6)(-) (2a, 2b), and PF(6)(-) (3a, 3b) salts, are described. The phosphine framework is conformationally locked, in the solid state, through pairs of intramolecular N-H...N hydrogen bonds which are maintained in the Ru(II) and Rh(III) complexes 4 and 5. Phosphines 1a-3b can be considered as charged variants of the well-known PTA ligand.
authors.affiliation: Department of Chemistry, Loughborough University, Loughborough, Leics LE11 3TU, UK.
authors.forename: Allen T
authors.initials: AT
authors.lastname: Ekubo
authors.forename: Mark R J
authors.initials: MR
authors.lastname: Elsegood
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Lake
authors.forename: Martin B
authors.initials: MB
authors.lastname: Smith