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The title square-planar nickel complex, [Ni(C20H22N2O6)], has Ni—N and Ni—O bond lengths of 1.8448 (14)/1.8478 (14) and 1.8536 (12)/1.8520 (12) Å. There is a slight twist in the two benzene rings at each end of the complex [dihedral angle = 11.11 (5)°]. All the atoms of the meth­oxy substitutents are in the plane of the ring to which they are attached except for one which deviates slightly [0.365 (3) Å]. In the crystal, weak C—H...O inter­molecular inter­actions connect the mol­ecules.

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In the title square-planar copper complex, [Cu(C20H22N2O6)], the Cu—N and Cu—O bond lengths are significantly longer than those of its isostructural nickel analog. The title structure is related to that of the corresponding monohydrate. There are significant differences in the conformations of the two complexes. While the monohydrate is mainly planar, in the title compound there is a slight twist in the two benzene rings at each end of the complex [dihedral angle = 13.14 (6)°]. All the atoms of the meth­oxy substitutents are in the plane of the ring to which they are attached (r.m.s. deviation = 0.0079 Å) except for one of the meth­oxy C atoms, which deviates slightly [0.309 (4) Å]. In the crystal, weak C—H...O inter­molecular inter­actions link the mol­ecules.

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The title compound, (C2H10N2)[Ni(C16H14N2O2)]4(ClO4)2·C3H7NO, crystallizes with four Ni(salen) mol­ecules {salen is 2,2′-[ethane-1,2-diylbis(nitrilo­methyl­idyne)]diphenolate}, one ethyl­enediammonium cation (actually two half-cations, each located on a center of inversion), two perchlorate anions and one dimethyl­formamide solvent mol­ecule in the asymmetric unit. Each NiII cation in the Ni(salen) complex is four-coordinated by two imine N atoms and two phenolate O atoms from the tetra­dentate ligand. The Ni(salen) units form parallel slipped stacks with Ni...Ni separations of 3.4541 (4) and 3.6442 (6) Å. The crystal packing is stabilized by inter­molecular hydrogen bonds between the ammonium H atoms and the perchlorate and salen O atoms, which generate a three-dimensional structure.

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The title FeIII complex, [Fe(C22H32N4O2)]I, contains a six-coordinate FeN4O2 cation in which the ligand is a reduced Schiff base resulting from the NaBH4 reduction of the condensation product between salicylaldehyde and 1,5,8,12-tetra­azadodecane. In spite of the increased flexibility of the saturated backbone of the ligand compared to the Schiff base from which it was synthesized, the complex adopts a cis-FeN4O2 conformation for the phenolic O-atom donors, which contrasts with the trans conformation adopted by the analogous ClO4 salt [Yisgedu et al. (2009). J. Chem. Crystallogr. 39, 315–319]. In addition to extensive N—H...I hydrogen bonding between the amine H atoms and the anion there is a weak C—H...I inter­action.

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The title salt, 2C16H15F3N3OS+·C6Cl2O42−, is composed of two independent cations of a lansoprazole {systematic name 2-([3-methyl-4-(2,2,2-trifluoroethoxy)pyridin-2-yl]methylsulfinyl)-1H-benzo[d]imidazole} inter­mediate and a dianion of chloranilic acid. In the cations of the lansoprazole inter­mediate, the dihedral angles between the least-squares planes of the pyridine and benzimidazole rings are 11.1 (6) and 13.1 (5)°, respectively. The dihedral angles between the mean plane of the benzene ring in the chloranilic acid dianion and the pryidine and benzimidazole rings of the two lansoprazole inter­mediate groups are 71.8 (1)/80.5 (7) and 74.2 (4)/74.8 (6)°. In addition to ionic bond inter­actions, the lansoprazole inter­mediate and chloranilic ions are connected by strong N—H...O hydrogen bonds, which produce a set of extended O—H...O—H...O—H chains along the b axis in the (011) plane. In addition, weak C—H...O, C—H...F, N—H...Cl and π–π [centroid–centroid distances = 3.5631 (15), 3.8187 (13), 3.7434 (17) and 3.842 (2) Å] inter­molecular inter­actions are observed, which contribute to crystal packing stability.

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The structure of the title compound, C19H28O2, has been redermined at 295 (2) K, with much improved precision. The structure and mol­ecular packing of the title compound was first reported by Coiro et al. [Acta Cryst. (1973). B29, 1404–1409] by means of potential-energy calculations. The cell parameters in this study differ considerably in space group C2. It is a derivative of testosterone and consists of a cyclo­penta­none ring (A) fused to to successive cyclo­hexane (B and C) and cyclo­hexa­none (D) rings. The three cyclo­hexa­none rings are in slightly distorted boat configurations and the cyclo­penta­none ring is a distorted half-chair. The crystal packing is stabilized by weak inter­molecular C—H...O inter­actions involving O atoms from each of the cyclo­hexa­none and cyclo­penta­none rings and H atoms from each of their respective rings.
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