A single crystal x-ray diffraction study of yttrium tartrate hydrate [Y(C4H4O6)(C6H5O6) ·2.5H2O]

Four metal–organic coordination polymers: {[Cd3(C4H4O6)3(H2O)]·H2O}nI, {[Cd3(C4H3O6)2(H2O)2]·5.5H2O}nII, {[Cd2(C4H4O6)2(H2O)]·3H2O}nIII, and [Cd(C4H4O6)]nIV were obtained under hydrothermal conditions and characterized by IR spectroscopy and single crystal X-ray diffraction. The structural analysis reveals that compounds I–III exhibit new 3D open frameworks filled with water molecules, which according to thermogravimetric analysis evolve at temperatures significantly lower than onset temperatures for decomposition. Compound I exhibits an 8-c net; uninodal net (eci net) with Schlafli symbol {36·412·510}, where Cd atoms are connected by μ4,κ6-mode and μ4,κ5-mode tartrate ligands. Compound II is a rare example of a tartrate trianion complex formed by μ5,κ6-mode ligands creating a (6,3)-connected net with Schlafli symbol (4·62)2(42·610·83). Compound III exhibits a 3,3,4,4-connected, 4-nodal net with Schlafli symbol {4·82}{4·84·10}, built up by dimers of two octahedral Cd atoms linked by μ4,κ6-mode and μ3,κ5-mode tartrate ligands. Compound IV was previously reported although being obtained under different synthetic conditions and can be described as a 5,5,11-connected, 3-nodal net with the Schlafli symbol of {32·46·52}2{34·414·516·618·72·8}{34·43·52·6}. None of the compounds reported here are topologically related, evidencing the versatility of the tartrate ligand for the framework formation of coordination polymers.

/pdf/synthesis-and-crystal-structure-of-three-new-cadmium-3yzfosxzha.pdf

Synthesis and crystal structure of three new cadmium tartrates with open frameworks

The title compound was prepared by the reaction of L-tartaric acid with [CoCO3(en)2]Br. It contains a dimer cation in which two cobalt atoms are bridged through a tridentate tartrate anion. The configuration about one cobalt atom is Δ-cis, and about another is trans(O,O).

THE CRYSTAL STRUCTURE OF μ-L-TARTRATO-DICOBALT(III) COMPLEX, Δ-cis(O,O),trans(O,O)-[(en)2Co(tart)(3−)Co(tart)(1−)(en)2]Na(C1O4)3·5H2O

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THE CRYSTAL STRUCTURE OF μ-L-TARTRATO-DICOBALT(III) COMPLEX, Δ-cis(O,O),trans(O,O)-[(en)2Co(tart)(3−)Co(tart)(1−)(en)2]Na(C1O4)3·5H2O