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1.  Ba5Cl4(H2O)8(VPO5)8: a novel three-dimensional framework solid 
The structure of Ba5Cl4(H2O)8(PVO5)8 consists of alternating anionic oxovanadium phosphate (VPO5) and cationic barium chloride hydrate, Ba5Cl4(H2O)8, layers. These layers are linked through Ba—O bonds, generating a three-dimensional framework.
The novel hydro­thermally synthesized title compound, penta­barium tetra­chloride octa­hydrate octa­kis(oxovanadium phosphate), Ba5Cl4(H2O)8(VPO5)8, crystallizes in the ortho­­rhom­bic space group Cmca with a unit cell containing four formula units. Two Ba2+ cations, two Cl− anions and the O atoms of four water mol­ecules are situated on the (100) mirror plane, while the third independent Ba2+ cation is on the inter­section of the (100) plane and the twofold axis parallel to a. Two phosphate P atoms are on twofold axes, while the remaining independent P atom and both V atoms are in general positions. The structure is characterized by two kinds of layers, namely anionic oxovanadium phosphate (VPO5), composed of corner-sharing VO5 square pyramids and PO4 tetra­hedra, and cationic barium chloride hydrate clusters, Ba5Cl4(H2O)8, composed of three Ba2+ cations linked by bridging chloride anions. The layers are connected by Ba—O bonds to generate a three-dimensional structure.
doi:10.1107/S0108270110001393
PMCID: PMC2855588  PMID: 20203389
2.  Ethyl 3,4-dimethyl-1H-pyrrole-2-carboxyl­ate 
The non-H atoms of the title compound, C9H13NO2, are almost coplanar (r.m.s. deviation = 0.0358 Å). Weak inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into zigzag chains along the b axis with graph-set motif C(5). The chains are further linked into a three-dimensional network by C—H⋯O hydrogen bonds and C—H⋯π inter­actions.
doi:10.1107/S160053681003179X
PMCID: PMC3008020  PMID: 21588658
3.  Ethyl 3,4-dimethyl-5-[(E)-(phenyl­imino)­meth­yl]-1H-pyrrole-2-carboxyl­ate 
In the title compound, C16H18N2O2, the mol­ecule adopts an E conformation about the C=N double bond. The dihedral angle between the pyrrole and phenyl rings is 41.55 (8)°. In the crystal structure, pairs of inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into centrosymmetric dimers. In the dimer, the two pyrrole rings are almost coplanar and the two phenyl rings are parallel to each other.
doi:10.1107/S1600536810022051
PMCID: PMC3006869  PMID: 21587883
4.  Aqua­[N-phenyl-2-(quinolin-8-yl­oxy)acetamide]dinitratozinc(II) 
In the title complex, [Zn(NO3)2(C17H14N2O2)(H2O)], the six-coordinated Zn atom is in a distorted octa­hedral geometry, the donor centers being two O atoms and one N atom from the tridentate organic ligand, a water O atom and two O atoms from two monodentate nitrate ions. In the crystal, O—H⋯O hydrogen bonds between the coordinated water mol­ecules and nitrate O atoms and N—H⋯O hydrogen bonds between the main ligand and nitrate O atoms consolidate the three-dimensional network.
doi:10.1107/S160053681000471X
PMCID: PMC2983540  PMID: 21580233
5.  Ethyl 5-[(2,3-dimethyl-5-oxo-1-phenyl-2,5-dihydro-1H-pyrazol-4-yl)imino­meth­yl]-3,4-dimethyl-1H-pyrrole-2-carboxyl­ate 
In the title compound, C21H24N4O3, the mol­ecule has an E configuration about the imine C=N double bond. Inter­molecular N—H⋯O hydrogen bonds assemble mol­ecules into centrosymmetric dimers.
doi:10.1107/S1600536809027780
PMCID: PMC2977180  PMID: 21583616
6.  Ethyl 5-formyl-3,4-dimethyl-1H-pyrrole-2-carboxyl­ate 
The mol­ecule of the title compound, C10H13NO3, is approximately planar (maximum deviation 0.1424 Å). In the crystal, mol­ecules are linked into inversion dimers by pairs of N—H⋯O hydrogen bonds, and the dimeric units are linked by non-classical C—H⋯O hydrogen bonds, forming a layered structure.
doi:10.1107/S160053680902323X
PMCID: PMC2969404  PMID: 21582923

Results 1-6 (6)