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author:("saffan, A. P.")
1.  Aqua­(2,2′-bipyridine-κ2 N,N′)(3,5-dinitro­benzoato-κO 1)copper(II) tetra­hydro­furan monosolvate 
The title complex, [Cu(C7H3N2O6)2(C10H8N2)(H2O)]·C4H8O, features a penta­coordinate CuII atom bound by two monodentate carboxyl­ate ligands, a bidentate 2,2′-bipyridine mol­ecule [dihedral angle between pyridine rings = 5.0 (2)°] and a water mol­ecule. The resulting N2O3 donor set defines a distorted square-pyramidal geometry with the coordinated water mol­ecule in the apical position. In the crystal, the presence of O—Hw⋯Oc (w = water and c = carbon­yl) hydrogen bonding leads to the formation of a supra­molecular chain propagating along the c axis, which associates into a double chain via C—H⋯ O and π–π contacts between pyridyl rings [centroid–centroid distance = 3.527 (3) Å]. The solvent mol­ecules, which are disordered over two orientations in a 0.678 (11):0.322 (11) ratio, occupy voids defined by the complex mol­ecules and are held in place via C—H⋯O inter­actions.
doi:10.1107/S1600536810030436
PMCID: PMC3008109  PMID: 21588481
2.  2,4,6,8-Tetra­kis(4-ethyl­phen­yl)-3,7-diaza­bicyclo­[3.3.1]nonan-9-one 
The bicyclo­[3.3.1]nonane ring in the title compound, C39H44N2O, adopts a chair–boat conformation with the four benzene rings being directed away from the carbonyl group. The presence of C—H⋯O contacts leads to helical supra­molecular chains along the b axis.
doi:10.1107/S1600536810016569
PMCID: PMC2979421  PMID: 21579409
3.  3,5-Bis(4-bromo­phen­yl)-1-phenyl-4,5-dihydro-1H-pyrazole 
In the title compound, C21H16Br2N2, the central pyrazole ring adopts an flattened envelope conformation, with the stereogenic C atom in the flap position. The deviations from planarity for this ring are relatively minor (r.m.s. deviation = 0.045 Å) and the dihedral angles formed with the N- and Cimine-bound benzene rings are 7.73 (13) and 11.00 (13)°, respectively. By contrast, the benzene ring bound at the chiral C atom is almost orthogonal to the rest of the mol­ecule; the dihedral angle formed between this ring and the pyrazole ring is 79.53 (13)°. In the crystal, the packing is stabilized by C—H⋯N and C—H⋯Br inter­actions.
doi:10.1107/S1600536810015795
PMCID: PMC2979444  PMID: 21579379

Results 1-3 (3)