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inorganic compounds
The structure of the complex phosphate KIn0.5Nb0.5OPO4 is merohedrally twinned about the [110] twofold axis. A cis-cis linkage of [MO6] octahedra embodies a new subclass of 4/m symmetry structures.
metal-organic compounds
In the isostructural title complexes, [M(C9H6N3O2)2(H2O)2] [M = CoII, (I), CdII, (II), and CuII, (III); the metal centres reside on a twofold axis in the space group C2/c for (I) and (II)], the metal centres are surrounded by four O atoms from two O,O′-bidentate carboxylate groups and by two trans-coordinated aqua ligands, forming a distorted octahedral environment. The molecules possess four hydrogen-bond donor (two aqua ligands) and four hydrogen-bond acceptor sites (two triazole groups), and aggregate by self-association, forming two-dimensional hydrogen-bonded frameworks [via O—H
N interactions; ON = 2.749 (3)–2.872 (3) Å]. The layers are parallel and are tightly packed with short interlayer distances of 4.93, 4.95 and 5.01 Å for (I), (II) and (III), respectively.
N interactions; ON = 2.749 (3)–2.872 (3) Å]. The layers are parallel and are tightly packed with short interlayer distances of 4.93, 4.95 and 5.01 Å for (I), (II) and (III), respectively.metal-organic compounds
Poly[[μ4-4,4′-bipyridazine-μ5-sulfato-disilver(I)] monohydrate], {[Ag2(SO4)(C8H6N4)]·H2O}n, (I), and poly[[aqua-μ4-pyridazino[4,5-d]pyridazine-μ3-sulfato-disilver(I)] monohydrate], {[Ag2(SO4)(C6H4N4)(H2O)]·H2O}n, (II), possess three- and two-dimensional polymeric structures, respectively, supported by N-tetradentate coordination of the organic ligands [Ag—N = 2.208 (3)–2.384 (3) Å] and O-pentadentate coordination of the sulfate anions [Ag—O = 2.284 (3)–2.700 (2) Å]. Compound (I) is the first structurally examined complex of the new ligand 4,4′-bipyridazine; it is based upon unprecedented centrosymmetric silver–pyridazine tetramers with tetrahedral AgN2O2 and trigonal–bipyramidal AgN2O3 coordination of two independent AgI ions. Compound (II) adopts a typical dimeric silver–pyridazine motif incorporating two kinds of square-pyramidal AgN2O3 AgI ions. The structure exhibits short anion–π interactions involving noncoordinated sulfate O atoms [Oπ = 3.041 (3) Å].
π = 3.041 (3) Å].organic compounds
In bis(2-carboxypyridinium) hexafluorosilicate, 2C6H6NO2+·SiF62−, (I), and bis(2-carboxyquinolinium) hexafluorosilicate dihydrate, 2C10H8NO2+·SiF62−·2H2O, (II), the Si atoms of the anions reside on crystallographic centres of inversion. Primary inter-ion interactions in (I) occur via strong N—HF and O—HF hydrogen bonds, generating corrugated layers incorporating [SiF6]2− anions as four-connected net nodes and organic cations as simple links in between. In (II), a set of strong N—HF, O—HO and O—HF hydrogen bonds, involving water molecules, gives a three-dimensional heterocoordinated rutile-like framework that integrates [SiF6]2− anions as six-connected and water molecules as three-connected nodes. The carboxyl groups of the cation are hydrogen bonded to the water molecule [OO = 2.5533 (13) Å], while the N—H group supports direct bonding to the anion [NF = 2.7061 (12) Å].
F and O—HF hydrogen bonds, generating corrugated layers incorporating [SiF6]2− anions as four-connected net nodes and organic cations as simple links in between. In (II), a set of strong N—HF, O—HO and O—HF hydrogen bonds, involving water molecules, gives a three-dimensional heterocoordinated rutile-like framework that integrates [SiF6]2− anions as six-connected and water molecules as three-connected nodes. The carboxyl groups of the cation are hydrogen bonded to the water molecule [OO = 2.5533 (13) Å], while the N—H group supports direct bonding to the anion [NF = 2.7061 (12) Å].
