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The crystal structure of the title compound, [Nd(C4H9NO)4(H2O)4][Fe(CN)6]·3H2O, contains two isolated mononuclear ions connected through hydrogen bonding between a water mol­ecule bonded to neodymium(III) and a cyano group bonded to iron(III). The coordination of the six cyano groups around iron(III) is close to ideal octahedral, while the eight ligands around neodymium(III) comprise a slightly distorted square antiprism. Three solvent water mol­ecules are included in the asymmetric unit and hydrogen bonding is abundant, creating an extended network. Three of the four di­methyl­acet­amide (DMA) mol­ecules bonded to Nd have various degrees of common structural disorder.

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In the title compound, [Cu2(C7H8O3)2(C5H5N)2], each centrosymmetric molecule contains two square-pyramidally coordin­ated Cu atoms connected to two O atoms from each of the two diacetyl­acetonate anions. The Cu atoms and the two diacetyl­acetonate anions are approximately coplanar, and the pyramidal coordination of Cu is completed by pyridine ligands, which coordinate to the two metals on opposite sides of this plane.

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The crystal structure of the title compound, {[Gd2(C8H4O4)3(C5H11NO)2]·H2O}n, consists of chains of Gd atoms inter­connected by a benzene-1,4-dicarboxyl­ate (BDC) linker. The chains are also intra­connected by carboxyl­ate groups from the BDC linker, thus generating a three-dimensional framework with large cavities. The coordination of the eight carboxyl­ate O atoms around the GdIII ion is distorted dodeca­hedral, due to the steric constraints of the carboxyl­ate groups. The large anisotropic displacement parameters of the atoms of the coordinated diethyl­formamide (DEF) and the disorder in their positions indicate loose bonding to the framework, and hence solvent exchange may be possible. Additionally, one water mol­ecule is located in the cavity.

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The crystal structure of the title compound, [Gd(C14H8O4)1.5(C5H11NO)]n, comprises chains of Gd atoms intra­connected by the carboxyl­ate groups of the biphenyl-4,4′-dicarboxyl­ate (BPDC) linkers, one of which is disposed about a twofold axis. The Gd atom chains are aligned along the b axis and are inter­connected by BPDC linkers, creating a three-dimensional framework. A single diethyl­formamide (DEF) mol­ecule is bonded to each Gd atom. This mol­ecule is positioned in the cavities formed by the inter­connection of the Gd atom chains via the BPDC linkers. Due to the steric constraints of the carboxyl­ate groups, the square antiprismatic coordination geometry of eight O atoms (one from the DEF mol­ecule and seven from carboxyl­ate groups) around Gd is distorted.
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