The hydrogen-bonded dimers of N,N′,N″-tricyclohexylphosphoric triamide in new tin(IV) and copper(II) complexes

Article abstract of DOI:10.1107/S010827011101403X

In the new tin(IV) and copper(II) complexes, cis-dichlorido-trans-dimethyl- cis-bis-(N,N′,N″-tricyclo-hexyl-phospho-ric triam-ide-κO) tin(IV), [Sn(CH₃)₂C₁₂(C₁₈H ₃₆N₃OP)₂], (I), and trans-diaqua-bis-(N, N′,N″-tricyclohexylphosphoric triamide-O)copper(II) dinitrate-N,N′,N″-tricyclohexylphosphoric triamide (1/2), [Cu(C ₁₈H₃₆N₃OP)₂(H₂O) ₂](NO₃)₂·2C₁₈H ₃₆N₃OP, (II), the N,N′,N″- tricyclohexylphospho-ric triamide (PTA) ligands exist as hydrogen-bonded dimers via P=O...H - N inter-actions around the metal center. The asymmetric unit in (I) consists of one complete complex mol-ecule located on a general position. The Sn^IV coordination geometry is octa-hedral 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(H₂O)₂]²⁺ dication on a special position (site symmetry for the Cu atom), one nitrate anion and one free PTA mol-ecule, both on general positions. The complex adopts a square-planar trans-[CuO₂O₂] coordination geometry, with the Cu ^II ion coordinated by two PTA ligands and two water mol-ecules. Each of the noncoordinated PTA mol-ecules is hydrogen bonded to a neighboring coordinated PTA molecule and an adjacent water mol-ecule; 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 mol-ecules in (II) adopt a slightly distorted tetra-hedral environment.