2,2′-Bi-1,3,4-thia­diazole-5,5′-diamine tetra­hydrate

In the title compound, C4H4N6S2·4H2O, the complete organic mol­ecule is generated by crystallographic twofold symmetry and the dihedral angle between the aromatic rings is 10.24 (3)°. In the crystal, inter­molecular N—H⋯N, N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds and aromatic π–π stacking inter­actions [centroid–centroid separations = 3.530 (3) and 3.600 (3) Å] are observed

Bis(1-carbamimidoyl-2-ethyl­isourea)copper(II) dinitrate

The copper(II) complex, [Cu(C4H10N4O)2](NO3)2 or [Cu(L 1e)2](NO3)2, where L 1e is 1-carbamimidoyl-2-ethyl­isourea, was obtained from a 1:2 molar ratio of copper(II) nitrate hemipenta­hydrate with 2-cyano­guanidine in ethanol. The crystal structure consists of the centrosymmetric [Cu(L 1e)2]2+ cation and two NO3 − counter-anions. The cation exhibits four-coordinate bonding of the two N,N-bidentate ligands and the CuII atom through the N-donor atoms, yielding a square-planar CuN4 geometry. Inter­molecular N—H⋯O hydrogen bonds link between the cation and and counter-anion, forming a two-dimentional layered structure extending parallel to (01)

catena-Poly[copper(I)-di-μ-bromido-copper(I)-bis­[μ-4-methyl-1H-1,2,4-triazole-5(4H)-thione-κ2 S:S]]

In the title coordination polymer, [CuBr(C3H5N3S)]n, the CuI atom adopts a tetra­hdral CuS2Br2 coordination geometry arising from two S-bonded 4-methyl-1H-1,2,4-triazole-3(4H)-thione ligands and two bromide ions. Both the S and Br atoms act as bridging ligands, connecting pairs of CuI atoms and generating chains propagating in [100]. Inter-chain N—H⋯N hydrogen bonds generate layers in the ac plane. Weak intra-chain N—H⋯Br inter­actions also occur

Diaqua­{2,6-bis­[N-(2-pyridinylmeth­yl)­carbamo­yl]­phenolato-κ2 O 1,O 2}zinc(II). Corrigendum

Corrigendum to Acta Cryst. (2008), E64, m884–m885

โครงสร้างผลึกของคอปเปอร์ (I) แฮไลด์และเอธิลีนไธโอยูเรีย

199

3,8-Dimethyl-4,7-diaza­deca-3,7-diene-2,9-dione dioxime

The complete mol­ecule of the title compound, C10H18N4O2, is generated by a crystallographic inversion centre at the mid-point of the central C—C bond. The two oxime groups have an E configuration. In the crystal, mol­ecules are linked through inter­molecular O—H⋯N hydrogen bonds

Di-μ-bromido-bis­({2-[(4,6-dimethyl­pyrimidin-2-yl)disulfan­yl]-4,6-dimethyl­pyrimidine-κ2 N 1,S 2}copper(I))

The title dinuclear complex, [Cu2Br2(C12H14N4S2)2], is located about an inversion center. The CuI ion is coordinated in a distorted tetra­hedral geometry by two bridging Br atoms in addition to an N and an S atom from the 2-[(4,6-dimethyl­pyrimidin-2-yl)disulfan­yl]-4,6-dimethyl­pyrimidine ligand. In the crystal, π–π stacking inter­actions are observed with a centroid–centroid distance of 3.590 (2) Å

Hetero triply-bridged dinuclear copper(II) compounds with ferromagnetic coupling : a challenge for current density functionals

Peer reviewe

Chlorido(1,3-dimethyl­thio­urea-κS)bis­(triphenyl­phosphine-κP)copper(I) acetonitrile hemisolvate

The title compound, [CuCl(C3H8N2S)(C18H15P)2]·0.5CH3CN, was prepared by the reaction of copper(I) chloride with 1,3-dimethyl­thio­urea (dmtu) and triphenyl­phosphine (PPh3) in acetonitrile. The CuI atom has a distorted tetra­hedral environment formed by two P atoms from triphenyl­phosphine, one S atom from the dmtu ligand and one Cl atom. In addition, the mol­ecules exhibit intra- and inter­molecular N—H⋯Cl inter­actions