Chun-Xia Ren

Trichlorido(N,N′-di-tert-butyl­benzamidinato-κ2N,N′)silicon

In the title molecule, C15H23Cl3N2Si, the Si atom is pentacoordinated by two N atoms [Si—N = 1.780 (3) and 1.931 (3) Å] from the benzamidinate ligand and three chloride anions [Si—Cl = 2.0711 (14)–2.1449 (14) Å] in a distorted trigonal-bipyramidal geometry.

2-[4-(4,5-Dihydro-1H-imidazol-2-yl)phen-yl]-4,5-dihydro-1H-imidazol-3-ium 4-amino-benzoate.

In the cation of the title compound, C12H15N4 +·C7H6NO2 −, the benzene ring makes dihedral angles of 30.51 (9) and 25.64 (9)° with the imidazole and imidazolinium rings, respectively. In the crystal, intermolecular N—H⋯O and N—H⋯N hydrogen-bonding interactions link the molecules into a three-dimensional network.

1,4-Bis(4,5-dihydro-1H-imidazol-2-yl)benzene-4-amino-benzene-sulfonic acid-water (1/2/2).

The asymmetric unit of the title compound, C12H14N4·2C6H7NO3S·2H2O, contains one half of a centrosymmetric 1,4-bis(4,5-dihydro-1H-imidazol-2-yl)benzene (bib) molecule, one 4-aminobenzenesulfonic acid molecule and one water molecule. In the bib molecule, the imidazole ring adopts an envelope conformation. The benzene rings of bib and 4-aminobenzenesulfonic acid are oriented at a dihedral angle of 21.89 (4)°. In the crystal structure, intermolecular N—H⋯O, O—H⋯N and O—H⋯O interactions link the molecules into a three-dimensional network. Weak π–π contacts between the benzene and imidazole rings and between the benzene rings [centroid–centroid distances = 3.895 (1) and 3.833 (1) Å, respectively] may further stabilize the structure.

Bis[2,6-bis-(4,5-dihydro-1H-imidazol-2-yl)pyridine]manganese(II) bis-(per-chlorate) acetonitrile solvate.

In the cation of the title compound, [Mn(C11H13N5)2](ClO4)2·CH3CN, the metal atom is located on a twofold rotation axis and is six-coordinated by six N atoms from two different 2,6-bis(4,5-dihydro-1H-imidazol-2-yl)pyridine (bip) ligands in a distorted octahedral geometry. The O atoms of the perchlorate anions are disordered with occupancies in the ratio 0.593 (10):0.407 (10). In the crystal, molecules are stabilized by two N—H⋯O hydrogen bonds, forming zigzag chains along the a axis, which are further interconnected by N—H⋯O hydrogen bonds and π–π interactions [centroid–centroid distance = 3.50 (1) Å] into a three-dimensional network.

Bis[μ-1,4-bis­(4,5-dihydro-1H-imidazol-2-yl)benzene-κ2N3:N3′]silver(I) dinitrate dihydrate

The reaction of 1,4-bis(4,5-dihydro-1H-imidazol-2-yl)benzene (bib) with silver(I) nitrate in a 1:1 molar ratio generates the metallacyclic title complex, [Ag2(C12H14N4)2](NO3)2·2H2O, in which the bib ligand displays a cis configuration. Each bib ligand acts as a bidentate bridging ligand connecting a pair of AgI ions to form a [2 + 2] metallamacrocycle in which the Ag⋯Ag distance is 6.77 (2) Å. Each AgI ion has weak contacts (2.91 Å) with the nitrate anion. The uncoordinated water molecules make hydrogen bonds with nitrate O atoms, forming chains. The H atoms attached to the uncoordinated nitrogen interact with these chains through N—H⋯O hydrogen bonds, forming layers parallel to the (11) plane.

2,2′-(p-Phenyl­ene)bis­(4,5-dihydro-1H-imidazol-3-ium) bis­(3-nitro­benzoate)

In the title compound, C12H16N4 +·2C7H4NO4 −, the complete 2,2′-(p-phenylene)bis(4,5-dihydro-1H-imidazol-3-ium) (bib) dication is generated by crystallographic inversion symmetry. The bib cations reside on crystallographic inversion centers, which coincide with the centroids of the respective benzene rings. In the cation, the imidazole ring adopts an envelop conformation with the flap atom displaced by 0.082 (3) Å from the plane through the other ring atoms. In the crystal, the cations and anions are linked through intermolecular N—H⋯O hydrogen bonds, forming chains running along the a axis. C—H⋯O interactions also occur. Weak π–π contacts between the imidazole rings of bib and between the benzene rings of NB [centroid–centroid distances = 3.501 (1) and 3.281 (2) Å, respectively] may further stabilize the structure.

1,4-Bis(4,5-dihydro-1H-imidazol-2-yl)benzene–terephthalic acid–water (1/1/4)

The asymmetric unit of the title compound, C(12)H(14)N(4)·C(8)H(6)O(4)·4H(2)O, consists of one half of the 1,4-bis-(4,5-dihydro-1H-imidazol-2-yl)benzene (bib) mol-ecule, one half of the terephthalic acid (TA) mol-ecule and two water mol-ecules. Both the bib and the TA mol-ecules reside on crystallographic inversion centers, which coincide with the centroids of the respective benzene rings. The bib and the TA, together with the water mol-ecules, are linked through inter-molecular O-H⋯O, O-H⋯N and N-H⋯O hydrogen bonds, forming a three-dimensional network of stacked layers. Weak inter-molecular C-H⋯O contacts support the stability of the crystal structure.

[2,6-Bis(4,5-dihydro-1H-imidazol-2-yl)pyridine]dichloridomanganese(II).

In the title compound, [MnCl2(C11H13N5)], the MnII ion is five-coordinated in a distorted square-pyramidal geometry, with three N atoms from the neutral tridentate 2,6-bis(4,5-dihydro-1H-imidazol-2-yl)pyridine ligand and one chloride ion forming the basal plane and the other chloride ion in the apical position. Both dihydroimidazole rings adopt envelope conformations. In the crystal structure, molecules are linked into a three-dimensional network by N—H⋯Cl and C—H⋯Cl hydrogen bonds.

Chlorido(pyridine-κN)bis­[2-(quinolin-2-yl)phenyl-κ2C1,N]iridium(III) mono­hydrate

In the neutral mononuclear iridium(III) title complex, [Ir(C15H10N)2Cl(C5H5N)]·H2O, the Ir atom is coordinated by two N atoms and two C atoms from two 2-(quinolin-2-yl)phenyl ligands, one N atom from a pyridine ligand and one Cl atom in an octahedral geometry.