Unusual metal-coordinated zwitterionic P-C-N-C-N-C phosphido adducts.

Rare examples of homodinuclear zwitterionic Pd(II) and Pt(II) complexes with bridging, two-coordinate P{cyclo-CH(2)N(R)CHN(R)CH(2)} ligands (R = 4-FC(6)H(4)CH(2), C(6)H(5)CH(2)) have been characterized by single-crystal X-ray diffraction using synchrotron radiation. Short N-C distances and enlarged N-C-N bond angles support electron delocalization in the central N-C-N backbone.

Intramolecular hydrogen-bonded tertiary phosphines as 1,3,5-triaza-7-phosphaadamantane (PTA) analogues.

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..