ABSTRACT: In the title compound, [Pr(C(32)H(30)N(2)O(6))(NO(3))]·CHCl(3), the Pr(III) ion is ten-coordinated by eight O atoms and two N atoms from the acyclic crown-type Schiff base ligand and the bidentate nitrate group. The coordination polyhedron around Pr(III) is a distorted bicapped square anti-prism. The chloro-form solvent mol-ecule is not involved either in coordination to the Pr(III) center or in hydrogen bonding to the complex. The Pr-O(phenolate) bonds are significantly shorter than the Pr-O(ether) and Pr-O(nitrate) bonds, which suggests that the Pr-O(phenolate) bond is stronger than these other bonds. In the crystal structure, the acyclic crown-type Schiff base ligand wraps around the Pr(III) centre, forming a pseudo-ring.
Project description:The title compound, C(31)H(38)N(2), was prepared from bis-(4-amino-cyclo-hexyl)methane and two equivalents of cinnamaldehyde. The cyclo-hexyl groups each show a chair conformation and the α,β-unsaturated imine side chains are all-trans configured. Two mol-ecules of the title compound as well as two trichloromethane solvent mol-ecules are present in the asymmetric unit. The solvent mol-ecules inter-act with the diimines via weak C-H⋯N hydrogen bonds.
Project description:The title compound, [PtCl(2)(C(13)H(11)O(2)P)(2)]·CHCl(3), has a rare PtCl(2) bridging of two dibenzooxaphospho-rine ligands through the metal atom. The Pt(II) ion is in a slightly distorted square-planar environment. The trichloro-methane solvent mol-ecule shows rotational disorder (major occupancy is 0.75) and is placed near to the inversion centre at (1/2, 1/2, 0) in channels parallel to the a axis. The solvent mol-ecule is linked to the complex mol-ecule via inter-molecular bifurcated C-H?Cl and C-H?O hydrogen bonds. The crystal structure is further stabilized by ?-? inter-actions involving the benzene rings, with a centroid-centroid distance of 3.658?(8)?Å.
Project description:The complete mol-ecule of the title compound, C(10)H(4)Cl(6)N(2), is generated by crystallographic twofold symmetry, with two C atoms lying on the rotation axis; the 1,8-naphthyridine ring is almost planar with an r.m.s. deviation of 0.0002 Å. In the crystal structure, the mol-ecules are stacked in an anti-parallel manner along [001]. Short Cl⋯Cl [3.3502 (4)] and Cl⋯N [3.2004 (11)-3.2220 (10) Å] contacts are observed in the crystal structure.
Project description:The asymmetric unit of the title salt, C(6)H(20)N(4) (2+)·2I(-), comprises half a 3,6-diaza-octane-1,8-diaminium dication plus an I(-) anion. The dications are symmetrical and lie across crystallographic centres of inversion. In the crystal, the ions form a network involving mainly weak N-H?I inter-molecular inter-actions: two H atoms of the ammonium group form inter-actions with two I(-) anions and the H atom of the secondary amine forms a weak inter-action with a third I(-) cation. The third ammonium H atom is hydrogen bonded to a secondary amine of an adjacent cation. The backbone of the cation does not form a uniformly trans chain, but is 'kinked' [C-N-C-C torsion angle = 71.5?(2)°], probably to accommodate the direct hydrogen bond between the ammonium group and the secondary amine in an adjacent cation.
Project description:In the crystal structure of the title compound, C(24)H(18)I(2)O(2), one benzene ring is almost coplanar with the naphthyl system [dihedral angle = 6.6 (4)°], whereas the other is almost orthogonal [73.1 (2)°]. The crystal structure is consolidated by C-H⋯O and C-H⋯π inter-actions.
Project description:In the title complex, [CuTb(C(19)H(20)N(2)O(4))(NO(3))(3)]·CH(3)COCH(3), the Cu(II) atom is four-coordinated by two O atoms and two N atoms from the deprotonated Schiff base in a square-planar geometry, while the Tb(III) atom is ten-coordin-ated by four O atoms from the deprotonated Schiff base and six O atoms from three bidentate nitrate anions. The compound is isostructural with the previously reported Gd(III) analogue [Elmali & Elerman (2004 ▶). Z. Naturforsch. Teil B, 59, 535-540], which was described in the space group P1 with two formula units in the asymmetric unit. The crystal stucture is, in fact, centrosymmetric and is described here in the space group P with one formula unit in the asymmetric unit.
Project description:In the title compound, C(26)H(30)ClN(5)O·CHCl(3), the purine mol-ecule consists of essentially planar benzene and purine ring systems [maximum deviation 0.010?(4)?Å for both ring systems] forming a dihedral angle of 85.52?(9)°. Inter-molecular N-H?N hydrogen bonds link adjacent mol-ecules into centrosymmetric dimers. The structure also contains inter-molecular C-H?O and C-H?N inter-actions. The benzene rings form offset face-to-face ?-? stacking inter-actions with an inter-planar distance of 3.541?(4)?Å and a centroid-to-centroid distance of 4.022?(4)?Å.
Project description:In the title mononuclear Schiff base complex, [Dy(NO(3))(3)(C(18)H(20)N(2)O(4))], the Dy(III) ion is ten-coordinated in a distorted hexa-deca-hedral geometry by six O atoms of three nitrate anions and four O atoms of the Schiff base ligand. An intra-molecular N-H?O hydrogen bond occurs. The crystal structure is stabilized by inter-molecular C-H?O hydrogen bonds.
Project description:The title compound, C(24)H(30)O(8), was obtained by reaction of ethyl 4-hy-droxy-benzoate with 1,2-dichloro-ethane. The mol-ecule occupies a crystallographic inversion center, with its central ethyl-ene bridge in an anti conformation. The other ethyl-ene bridge has a gauche conformation, with the corresponding O-C-C-O torsion angle being 74.2?(1)°. The benzene rings are almost coplanar with the adjacent eth-oxy-carbonyl groups, with an r.m.s. deviation of 0.078?Å.
Project description:In the mononuclear salen-type complex, [Er(NO(3))(3)(C(18)H(20)N(2)O(4))], the Er(III) ion is ten-coordinated in a distorted hexa-deca-hedral geometry by six O atoms of three nitrate anions and four O atoms of the salen-like ligand. Inter-molecular N-H⋯O hydrogen bonds occur. The crystal structure is stabilized by inter-molecular C-H⋯O hydrogen bonds.