rac-5-Diphenylacetyl-2,2,4-trimethyl-2,3,4,5-tetrahydro-1,5-benzothiazepine and rac-5-formyl-2,2,4-trimethyl-2,3,4,5-tetrahydro-1,5-benzothiazepine.

rac-5-Diphenylacetyl-2,2,4-trimethyl-2,3,4,5-tetrahydro-1,5-benzothiazepine, C(26)H(27)NOS, (I), and rac-5-formyl-2,2,4-trimethyl-2,3,4,5-tetrahydro-1,5-benzothiazepine, C(13)H(17)NOS, (II), are both characterized by a planar configuration around the heterocyclic N atom. In contrast with the chair conformation of the parent benzothiazepine, which has no substituents at the heterocyclic N atom, the seven-membered ring adopts a boat conformation in (I) and a conformation intermediate between boat and twist-boat in (II). The molecules lack a symmetry plane, indicating distortions from the perfect boat or twist-boat conformations.

Three-dimensional frameworks built from piperazine-2,5-dione and simple metal salts (M = Co, Ni, Cu and Ag).

Compounds trans-tetraaquadichloridocobalt(II)-piperazine-2,5-dione (1/1), [CoCl(2)(H(2)O)(4)].C(4)H(6)N(2)O(2), (I), and trans-tetraaquadichloridonickel(II)-piperazine-2,5-dione (1/1), [NiCl(2)(H(2)O)(4)].C(4)H(6)N(2)O(2), (II), are isomorphous.

Sheets built from C-H...O and C-H...pi(arene) hydrogen bonds in (2RS,6SR)-N-diphenylacetyl-2,6-diphenylpiperidin-4-one and (2RS,3SR,5RS,6SR)-3,5-dimethyl-N-phenylacetyl-2,6-diphenylpiperidin-4-one.

In (2RS,6SR)-N-diphenylacetyl-2,6-diphenylpiperidin-4-one, C31H27NO2, (I), the piperidinone ring adopts an almost ideal twist-boat conformation, and the molecules are linked into sheets by a combination of one C-H...

Hydrogen-bonded sheets in racemic cis-(2,2'-bipyridyl-kappa2N,N')oxo(pentane-2,4-dionato-kappa2O,O')(thiocyanato-kappaN)vanadium(IV).

The title compound, [V(C5H7O2)(NCS)O(C10H8N2)], crystallizes with Z' = 2 in the space group Pbca. The molecules are linked into sheets by a combination of four C-H..

Racemic cis-methoxobis(2-methyl-3-oxo-4H-pyran-4-olato)oxovanadium(V) redetermined at 120 K: hydrogen-bonded ribbons containing R2/2(7), R2/2(14) and R4/4(18) rings.

In the title compound, [V(CH3O)(C6H5O3)2O], the V-O bond lengths to the oxo and methoxo ligands are 1.593 (3) and 1.768 (3) A, respectively, at 120 K; the V-O bond lengths trans to these two ligands are 2.

2-(2-Pyridyl)pyridinium perchlorate, redetermined at 120 K: complex hydrogen-bonded sheets.

In the title compound, C10H9N2+.ClO4-, the ions are linked into complex sheets by the combination of one N-H..

Di-mu-halogeno-bis[halogeno(triphenylphosphine)mercury(II)], [Ph3PHgX(mu-X)2XHgPPh3], reinvestigated at 120 K for X = Cl and Br, and a second polymorph for X = I, also at 120 K.

Di-mu-chloro-bis[chloro(triphenylphosphine)mercury(II)], [Hg2Cl4(C18H15P)2], (I), and di-mu-bromo-bis[bromo(triphenylphosphine)mercury(II)], [Hg2Br4(C18H15P)2], (II), have been reinvestigated at 120 K. The molecules of (I) lie across inversion centres in space group P2(1)/n, and in both (I) and (II) the complexes are linked into three-dimensional frameworks by a combination of C-H..

Piperazine-2,5-dione-oxalic acid-water (1/1/2) and a redetermination of piperazine-2,5-dione, both at 120 K: hydrogen-bonded sheets containing multiple ring types.

In piperazine-2,5-dione-oxalic acid-water (1/1/2), C4H6N2O2.C2H2O4.2H2O, both organic components lie across inversion centres in space group P-1.

Orthorhombic and monoclinic polymorphs of 1,3,5-triphenylperhydro-1,3,5-triazine-2,4,6-trione at 120 K: chains and sheets formed by C-H...pi(arene) hydrogen bonds.

The title compound, C21H15N3O3, crystallizes in two polymorphic forms. In the orthorhombic polymorph, (I), in space group Fdd2 with Z' = 1, the molecules lie in general positions, while in the monoclinic polymorph, (II), in space group C2/c with Z' = 1/2, the molecules lie across twofold rotation axes. In each polymorph, the molecules are linked by a single C-H.

Partially oxidized [2-[(benzoylmethylene)diphenyl-lambda5-phosphino]ethyl]diphenylphosphine as a monohydrate.

The title compound is a co-crystal of [2-[(benzoylmethylene)diphenyl-lambda5-phosphino]ethyl]diphenylphosphine oxide, [2-[(benzoylmethylene)diphenyl-lambda5-phosphino]ethyl]diphenylphosphine and water in an approximate 2:1:3 ratio, with an overall composition of C34H30O1.678P2.H2O.

Micro-ethane-1,2-diylbis(diphenylphosphine oxide)-kappa(2)O:O'-bis[dibenzyldichlorotin(IV)]: a centrosymmetric complex containing trigonal-bipyramidal tin(IV), linked into chains of rings by C-H.pi(arene) hydrogen bonds.

The title compound, [Sn(2)Cl(4)(C(7)H(7))(4)(C(26)H(24)O(2)P(2))], (I), was isolated from the reaction of 1,2-bis(diphenylphosphino)ethane with dibenzyltin(IV) dichloride in the presence of air. The molecules of (I) lie across centres of inversion in space group C2/c and contain five-coordinate Sn atoms. The molecules are linked into chains of rings by a single C-H.

6,6'-dimethoxy-2,2'-[(1R,2R)-cyclohexane-1,2-diylbis(nitrilomethylidyne)]diphenol: three C-H...O hydrogen bonds generate a three-dimensional framework.

Molecules of the title compound, alternatively called (R,R)-N,N'-bis(3-methoxysalicylidene)-trans-cyclohexane-1,2-diamine, C(22)H(26)N(2)O(4), contain two intramolecular O-H.N hydrogen bonds and adopt a conformation with approximate twofold rotational symmetry. The molecules are linked by three C-H.