No abstract

The new co-crystal copper(II) melamine complex poly[bis(μ-methacrylato)μ-(1,3,5-triazine-2,4,6-triamine)], C 19 H 26 Cu 2 N 6 O 8 (1) crystallizes in the triclinic P-1 space group with a = 8.9670(2) Å, b = 9.4108(2) Å, c = 15.4476(3) Å, α = 96.6090(10)°, β = 100.6270(9)°, γ = 95.5950(10)°. Each Cu(II) exhibits a pseudooctahedral geometry. Four coplanar carboxylate oxygen atoms coordinated to the Cu(II) ion define the basal plane, whereas the apical position is occupied by one nitrogen atom from the melamine ligand. Here, the carboxylato-bridged two dinuclear copper(II) complexes are linked through melamine giving a 1D alternating chain. The structure of 1 consists of a two-dimensional supramolecular layer constructed by intermolecular N-H…N hydrogen bonds of the melamine ligands from adjacent one-dimensionalMuch attention has been paid to 1D, 2D and 3D coordination polymers because they can meet the need of functional materials with desired structures and properties [1][2][3][4][5]. One strategy in the design and synthesis of coordination architectures is the building-block approach. Commonly, bi-or multidentate organic ligands containing N [6, 7] or O [8,9] atoms have ever been used in the construction. In our current work, we have selected an excellent hydrogen donor and hydrogen acceptormelamine (MA). Containing three nitrogen atoms as part of a six-member aromatic heterocycle and three amino groups at three carbon atoms of the cycle, MA has exhibited diversified hydrogen bonding modes and extremely interesting architectures [10][11][12][13][14][15][16][17]. We report here the structure of a copper(II) complex with direct bonding of melamine to the metal ion.Experimental. Synthesis. Copper sulphate (0.16 g, 1 mmol) was dissolved in methanol (20 ml) in a 50 ml round bottom flask; sodium azide (0.033 g, 0.5 mmol) was added and refluxed for 15 min; melamine (0.252 g, 2 mmol) was added and refluxed for 5 h. Then methacrylic acid (0.17 ml, 2 mmol) was added and refluxed for 40 min; the greenish solution formed was filtered, the filtrate kept for evaporation; green crystals were obtained from solution after five days.X-Ray diffraction analysis. A greenish crystal suitable for data collection was mounted on glass fibres and data collection was performed on a Bruker SMART APEX II CCD diffractometer with graphite monochromated MoK α radiation at 296 K. The structures were solved by direct methods using SHELXS-97 and refined by full-matrix least squares methods on F 2 using SHELXL-97 [18] from within the WINGX [19] suite of software. All non-hydrogen atoms were refined anisotropically. All hydrogen atoms were located from the electron density difference synthesis and refined isotropically.

A new mixed-ligand copper(II) complex of 1,10-phenanthroline (phen) and benzoate ligands having the general formula [Cu(phen)(C 6 H 5 CO 2 ) 2 ] is prepared and its crystal structure is determined by X-ray crystallography. The complex exists in the monomeric form; the coordination environment around the copper(II) ion is square planar, with the pair of monodentate benzoate ligands being in a cis disposition. In the crystal, the molecules are linked into [001] chains by weak C-H⋯O interactions; no aromatic π-π stacking occurs.

The complete mol­ecule of the title compound, C17H22N2O4S2, is generated by crystallographic twofold symmetry, with one C atom lying on the rotation axis. The dihedral angle between the benzene rings is 44.04 (7)° and the conformation of the central N—C—C—C group is gauche. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, generating corrugated (010) sheets, and weak C—H⋯O inter­actions consolidate the packing.

Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.005 Å; R factor = 0.062; wR factor = 0.187; data-to-parameter ratio = 19.8.In the title compound, C 22 H 24 N 2 O 4 S 2 , the dihedral angles between the central benzene ring and the pendant rings are 66.96 (13) and 69.37 (13) . The torsion angles for the C-N-S-C fragments are À68.5 (3) and À72.6 (3). In the crystal, molecules are linked by N-HÁ Á ÁO hydrogen bonds to generate infinite (001) sheets containing R 4 4 (28) loops. A weak aromatic -stacking contact between one of the terminal benzene rings and its inversion-related partner is also observed [centroid-to-centroid separation = 3.796 (2) Å and slippage = 1.581 Å ], as are two possible C-HÁ Á Á contacts. Related literature Data collectionBruker APEXII CCD diffractometer 19493 measured reflections 5417 independent reflections 3937 reflections with I > 2(I) R int = 0.030