Topography of cyclodextrin inclusion complexes. 27. Disordered guest and water molecules, three-center and flip-flop O-H.cntdot..cntdot..cntdot.O hydrogen bonds in crystalline .beta.-cyclodextrin ethanol octahydrate at T = 295K: a neutron and x-ray diffraction study

Abstract The title compounds [R2NH2][C2O4SnMe3](R=i-Bu, Cy), in which tin atoms adopt a distorted trigonal bipyramidal configuration, have been prepared and submitted to an X-ray diffraction study. These compounds have been obtained from the reaction of (Cy2NH2)2C2O4·H2O or (i-Bu2NH2)2C2O4 with SnMe3Cl. In both [R2NH2][C2O4SnMe3] compounds, the trans complex has an almost regular trigonal bipyramidal geometry around the tin atom. The SnMe3 residues are connected as a chain with bridging oxalate anions in a trans-SnC3O2 framework, the oxygen atoms being in axial positions. The cations connect linear adjacent chains through NH…O hydrogen bonds giving layered structures.

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Topography of cyclodextrin inclusion complexes. 15. Crystal and molecular structure of the cyclohexaamylose-7.57 water complex, form III. Four- and six-membered circular hydrogen bonds

Journal of the American Chemical Society ◽

10.1021/ja00397a021 ◽

1981 ◽

Vol 103 (7) ◽

pp. 1708-1715 ◽

Cited By ~ 151

Author(s):

K. K. Chacko ◽

W. Saenger

Keyword(s):

Molecular Structure ◽

Hydrogen Bonds ◽

Inclusion Complexes ◽

Crystal And Molecular Structure ◽

Complex Form ◽

Water Complex ◽

Cyclodextrin Inclusion Complexes ◽

Cyclodextrin Inclusion

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A novel dinuclear bismuth(III) coordination compound: bis(μ-pyridine-2,6-dicarboxylato)-κ4O2,N,O6:O6′;κ4O2:O2′,N,O6-bis[(azido-κN)(1,10-phenanthroline-κ2N,N′)bismuth(III)] tetrahydrate

Acta Crystallographica Section C Structural Chemistry ◽

10.1107/s2053229614009863 ◽

2014 ◽

Vol 70 (6) ◽

pp. 562-565 ◽

Cited By ~ 4

Author(s):

Wei Zhang ◽

Yu-Quan Feng

Keyword(s):

Molecular Structure ◽

Hydrogen Bonds ◽

Coordination Compound ◽

Photoelectron Spectroscopy ◽

Three Dimensional ◽

Water Molecules ◽

Stacking Interactions ◽

Coordination Geometry ◽

X Ray Diffraction ◽

X Ray

A novel dinuclear bismuth(III) coordination compound, [Bi2(C7H3NO4)2(N3)2(C12H8N2)2]·4H2O, has been synthesized by an ionothermal method and characterized by elemental analysis, energy-dispersive X-ray spectroscopy, IR, X-ray photoelectron spectroscopy and single-crystal X-ray diffraction. The molecular structure consists of one centrosymmetric dinuclear neutral fragment and four water molecules. Within the dinuclear fragment, each BiIIIcentre is seven-coordinated by three O atoms and four N atoms. The coordination geometry of each BiIIIatom is distorted pentagonal–bipyramidal (BiO3N4), with one azide N atom and one bridging carboxylate O atom located in axial positions. The carboxylate O atoms and water molecules are assembledviaO—H...O hydrogen bonds, resulting in the formation of a three-dimensional supramolecular structure. Two types of π–π stacking interactions are found, with centroid-to-centroid distances of 3.461 (4) and 3.641 (4) Å.

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