Coordination of 1-methyl-1,3-dihydro-2-benzimidazole-2-selone to zinc and cadmium: Monotonic and non-monotonic bond length variations for [H(sebenzim)]MCl complexes (M = Zn, Cd, Hg).

The reactions of 1-methyl-1,3-dihydro-2-benzimidazole-2-selone, H(sebenzim), towards the zinc and cadmium halides, MX (M = Zn, Cd; X = Cl, Br, I), afford the adducts, [H(sebenzim)]MX, which have been structurally characterized by X-ray diffraction. The halide ligands of each of these complexes participate in hydrogen bonding interactions with the imidazole N-H moieties, although the nature of the interactions depends on the halide. Specifically, the chloride and bromide derivatives, [H(sebenzim)]ZnX and [H(sebenzim)]CdX (X = Cl, Br), exhibit two intramolecular N-H•••X interactions, whereas the iodide derivatives, [H(sebenzim)]ZnI and [H(sebenzim)]CdI, exhibit only one intramolecular N-H•••I interaction.

N-Benzoyl-N',N''-dicyclo-hexyl-phospho-ric triamide.

In the title compound, C(19)H(30)N(3)O(2)P, the central P atom has a distorted tetra-hedral configuration. The N atoms in both cyclo-hexyl-amide moieties exhibit a slight deviation [0.32 (7) and 0.

N,N'-Dibenzyl-N,N'-dimethyl-N''-(4-nitro-benzo-yl)phospho-ric triamide.

The P atom in the title compound, C(23)H(25)N(4)O(4)P, is in a slightly distorted tetra-hedral coordination environment and the N atoms show sp(2) character. The phosphoryl group and the NH unit are syn with respect to each other. In the crystal, pairs of inter-molecular N-H⋯O(P) hydrogen bonds form centrosymmetric dimers.

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

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.

N,N',N'',N'''-Tetrakis(2-methylphenyl)-oxybis(phospho-nic diamide): a redetermination at 150 K with Mo Kα radiation.

The structure of the title compound, C(28)H(32)N(4)O(3)P(2), has been redetermined at 150 K, with much improved precision. The structure and mol-ecular packing of the title compound was previously determined using Cu Kα radiation, with an R value of 0.0933 [Cameron et al.

N,N'-Dicyclo-hexyl-N,N'-dimethyl-N''-(4-nitro-benzo-yl)phospho-ric triamide.

The P atom in the title compound, C(21)H(33)N(4)O(4)P, is in a slightly distorted tetra-hedral coordination environment and the phosphoryl and carbonyl groups are anti to each other. The environment of each N atom is essentially planar (average angles of 119.9 and 118.