title: The hydrogen-bonded dimers of N,N',N''-tricyclohexylphosphoric triamide in new tin(IV) and copper(II) complexes.
abstract: In the new tin(IV) and copper(II) complexes, cis-dichlorido-trans-dimethyl-cis-bis(N,N',N''-tricyclohexylphosphoric triamide-κO)tin(IV), [Sn(CH(3))(2)Cl(2)(C(18)H(36)N(3)OP)(2)], (I), and trans-diaquabis(N,N',N''-tricyclohexylphosphoric triamide-κO)copper(II) dinitrate-N,N',N''-tricyclohexylphosphoric triamide (1/2), [Cu(C(18)H(36)N(3)OP)(2)(H(2)O)(2)](NO(3))(2)·2C(18)H(36)N(3)OP, (II), the N,N',N''-tricyclohexylphosphoric triamide (PTA) ligands exist as hydrogen-bonded dimers via P=O···H-N interactions around the metal center. The asymmetric unit in (I) consists of one complete complex molecule located on a general position. The Sn(IV) coordination geometry is octahedral with two cis hydrogen-bonded PTA ligands, two cis chloride ligands and two trans methyl groups. The asymmetric unit in (II) contains one half of a [Cu(PTA)(2)(H(2)O)(2)](2+) dication on a special position (site symmetry ̅1 for the Cu atom), one nitrate anion and one free PTA molecule, both on general positions. The complex adopts a square-planar trans-[CuO(2)O(2)] coordination geometry, with the Cu(II) ion coordinated by two PTA ligands and two water molecules. Each of the noncoordinated PTA molecules is hydrogen bonded to a neighboring coordinated PTA molecule and an adjacent water molecule; the phosphoryl O atom acts as a double-H-atom acceptor. The P atoms in the PTA ligands of both complexes and in the noncoordinated hydrogen-bonded molecules in (II) adopt a slightly distorted tetrahedral environment.
authors.affiliation: Department of Chemistry, Ferdowsi University of Mashhad, Mashhad 91779, Iran. mehrdad_pourayoubi@yahoo.com
authors.forename: Mehrdad
authors.initials: M
authors.lastname: Pourayoubi
authors.forename: James A
authors.initials: JA
authors.lastname: Golen
authors.forename: Mahnaz Rostami
authors.initials: MR
authors.lastname: Chaijan
authors.forename: Vladimir
authors.initials: V
authors.lastname: Divjakovic
authors.forename: Monireh
authors.initials: M
authors.lastname: Negari
authors.forename: Arnold L
authors.initials: AL
authors.lastname: Rheingold