Cs_2.91Na_1.34Fe³⁺_0.25[Fe₃O(SO₄)₆(H₂O)₃]·5H₂O, a member of the Maus's salt family

In the title compound, a member of the Maus's salt family, [Fe₃O(SO₄)₆(H₂O)₃]⁵⁻ anion complexes are held together by Na⁺, Cs⁺ and Fe³⁺ cations in seven different sites and by five water mol­ecules to form a polar noncentrosymmetric monoclinic structure.

The polar phase of Li₂Ge₄O₉ at 298, 150 and 90 K

The structure of Li₂Ge₄O₉ has been determined to show the space group P2₁ca between 298 and 90 K, thus being in the polar state. A detailed description of structure and temperature variation is given.

Electrochemical properties of a cobalt(II) complex with sulfadiazine and 1,3-bis­(pyridin-4-yl)propane

A one-dimensional polymeric structure of Co^II with sulfadiazine and 1,3-bis­(pyridin-4-yl)propane is further stabilized by inter­molecular hydrogen bonding. The structure is of inter­est with respect to its electrochemical properties in the reduction reaction of H₂O₂ to H₂O. Investigation of the thermal stability shows that the complex is stable up to 543 K.

The double-stranded ladder-like structure of poly[[bis­(μ₂-acetato-κ²O:O′)bis­(acetato-κO)bis­(μ-4,4′-bi­pyridine-κ²N:N′)dicopper(II)] 4-nitro­phenol disolvate tetra­hydrate]

The title complex shows a prominent double-stranded ladder-like coordination polymer featuring square-pyramidal geometry around the two Cu^II centres.

Chlorido­bis­[2-(di­phenyl­phosphanyl)ethanamine-κ²P,N](tri­phenylphos­phane-κP)ruthenium(II) chloride toluene monosolvate

The chiral stereochemistry and the mer-P and cis-N coordination of the chlorido­bis­[2-(di­phenyl­phosphanyl)ethanamine-κ²P,N](tri­phenyl­phosphane-κP)ruthenium(II) cation, [RuCl(PPh₃){Ph₂P(CH₂)₂NH₂-κ²P,N}₂]⁺, is unique in ruthenium–amino­phosphane chemistry.

2,5-Bis[4-methyl-3-(pyridin-3-yl)phen­yl]-1,3,4-oxa­diazole and its one-dimensional polymeric complex with ZnCl₂

In a polymer of 2,5-bis­[4-methyl-3-(pyridin-3-yl)phen­yl]-1,3,4-oxa­diazole (L) with ZnCl₂, one-dimensional P (plus) and M (minus) helical chains are formed, where the ligand has different directions of twist. The helical chains stack together via inter­chain π–π and C—H⋯π inter­actions.

(Hexa­fluoro­silicato-κ²F,F′)bis­(1,10-phenanthroline-κ²N,N′)zinc(II) methanol monosolvate

The title compound contains a neutral heteroleptic tris-chelate Zn^II complex, viz. [Zn(SiF₆)(phen)₂] (phen is 1,10-phenanthroline), exhibiting approximate mol­ecular C₂ point-group symmetry, and represents the first structurally characterized example of a Zn^II complex bearing a bidentate-bound hexa­fluoro­silicate ligand.

Bis{μ-2,2′-[(butane-2,3-diyl­idene)bis­(aza­nylyl­idene)]di­benzene­thiol­ato}dizinc(II)–di­methyl sulfoxide–methanol (2/0.18/0.82)

The title compound has a metallic cluster structure with a rhomboidal Zn₂S₂ arrangement. Each Zn^II atom is five-coordinated and exhibits distorted trigonal bipyramidal geometry. The structure may be of inter­est with respect to zinc–thiol­ate bonds, the coordination chemistry of Schiff bases and the folding of proteins.

Aluminium(III) amidinates formed from reactions of `AlCl' with lithium amidinates

The reaction of metastable aluminum monochloride in the presence of lithium amidinates results in the formation of Al^III amidinates upon heating. Two novel heteroleptic Al^III bis-amidinate chlorides and one homoleptic Al^III tris-amidinate complex are reported.

Poly[di­aqua­[μ₄-4-(isonicotinamido)­phthalato]nickel(II)] displaying an sra topology

A 4-(isonicotinamido)­phthalate ligand links Ni^II centres into a three-dimensional structure with sra topology. The structure is stabilized by N—H⋯O hydrogen bonding between uncoordinated amide groups and extensive O—H⋯O hydrogen bonding between the coordinated water mol­ecules.

A tri­methyl­sulfonium salt with a novel polymeric cadmate anion

A rare two-dimensional organically templated halocadmate with a novel polymeric anion has been synthesized and characterized. It consists of tri­methyl­sulfonium cations sandwiched between layers of a two-dimensional μ₂-chlorido-di-μ₂-thio­cyanato-cadmate(II) polyanion.

A three-dimensional polymeric potassium complex of 5-sulfono­benzene-1,2,4-tri­carb­oxy­lic acid: poly[μ-aqua-aqua-μ₉-(2,4-dicarb­oxy-5-sulfonato­benzoato)-dipotassium(I)]

A three-dimensional polymeric potassium complex incorporating bridging water mol­ecules and 2,4-dicarb­oxy-5-sulfonato­benzoate ligands forms a one-dimensional inorganic chain with cage-like K₄(SO₃)₂ repeat units. The chains are bridged by carb­oxy­lic acid groups to form a two-dimensional layer, and these layers are further linked by carboyxlate groups and benzene rings to generate a three-dimensional framework.

The heterometallic cadmium–silver complex cis-bis­[di­cyanido­argentato(I)-κN]bis­(5,5′-di­methyl-2,2′-bi­pyridyl-κ²N,N′)cadmium(II) monohydrate

In the title hydrated mixed cadmium–silver complex, the Cd^II cation is coordinated by two bidentate 5,5′-dimethyl-2,2′-bipyridyl ligands and two monodentate [Ag^I(CN)₂]⁻ anions, which are in a cis arrangement around the Cd^II cation, leading to an octa­hedral CdN₆ geometry.

catena-Poly[[di-μ₂-aqua-hexa­aquabis­(μ₃-4-oxido­pyridine-2,6-di­carboxyl­ato)tri­manganese(II)] trihydrate]: a new one-dimensional coordination polymer based on a trinuclear Mn^II complex of chelidamic acid

A one-dimensional coordination polymer with a twofold symmetric repeat unit containing three Mn^II centres. Two different coordination geometries are observed for the two independent Mn^II metal centres, viz. a distorted penta­gonal bipyramid and a distorted octa­hedron.

Zigzag polymer chains in catena-poly[[[tri­aqua(isobutyrato-κO)magnesium(II)]-μ-isobutyrato-κ²O:O′] monohydrate]

The title compound comprises one-dimensional zigzag polymers of Mg^II cations bridged by isobutyrate groups. The crystal structure is characterized by stacks of hydro­phobic (isobutyrate) and hydro­philic (H₂O) groups that alternate along the a axis.

A one-dimensional cadmium metal–organic chain based on a [Cd₄(COO)₄] secondary building unit and a flexible di­carb­oxy­lic acid ligand

The structural evidence for the formation of a cluster-based chain-like polymeric structure incorporating both syn and anti conformers of a flexible dicarboxylate ligand is reported.

2-Amino-5-iodo­pyridinium bromide hemihydrate and 2-amino-5-iodo­pyridinium chloride monohydrate

The title hydrate salts exhibit similar hydrogen bonding and π-stacking in their crystal structures. The most interesting feature of the hydrochloride salt is the presence of an additional fractional HCl molecule which introduces disorder in the location of the water molecule.

Four related di­ethyl [(aryl­amino)­(4-ethynylphen­yl)meth­yl]phosphon­ates

The conformations of the anilino(phenyl)methyl groups are similar in four related diethyl [(aryl­amino)­(4-ethynyl­phenyl)methyl]phosphon­ates. In each compound, the P—C bond has an approximate staggered conformation, with the aniline and ethynyl­phenyl groups in gauche positions with respect to the P=O double bond, and the two six-membered rings are almost perpendicular.

Solvent-mediated pseudo-quadruple hydrogen-bond motifs in three lamotrigine–carb­oxy­lic acid complexes

The crystal structures of three solvent-mediated lamotrigine–aromatic carb­oxy­lic acid complexes exhibit similar hydrogen-bonding motifs and display isostructurality.

C₅ and C₇ intra­molecular hydrogen bonds stabilize the structure of N-pyrazinoyl-gabapentin (Pyr-Gpn-OH)

In the title N-protected derivative of gabapentin (Gpn), the mol­ecular conformation is stabilized by intra­molecular five- (C₅) and seven-membered (C₇) hydrogen-bonded rings. The packing of the mol­ecules reveals O—H⋯O and C—H⋯N inter­molecular hydrogen bonds, together with π–π inter­actions.

1-Carb­oxy­methyl-3-methyl-1H-imidazol-3-ium chloride 2-(3-methyl-1H-imidazol-3-ium-1-yl)acetate monohydrate: a crystal stabilized by imidazolium zwitterions

Two imidazolium moieties form a homoconjugated cation through a strong and asymmetric O—H⋯O hydrogen bond. In the crystal packing, chloride anions and water mol­ecules are linked via O—H⋯Cl hydrogen bonds, forming an infinite one-dimensional chain.

Two seven-membered heterocycles with 1,2-di­aza ring N atoms: 3,5,7-tri­phenyl-1,2-di­aza­cyclo­hepta-1(7),2-diene and 3,7-bis­(2-hy­droxy­phen­yl)-5-phenyl-1,2-di­aza­cyclo­hepta-1(7),2-diene

Two compounds containing seven-membered heterocyclic rings with 1,2-diaza N atoms have been synthesized and characterized. In each, the C₅N₂ ring adopts a twist-boat conformation.

New rac-XP(O)(OC₆H₅)(NHC₆H₄-p-CH₃) [X = N(CH₃)(cyclo-C₆H₁₁) and NH(C₃H₅)] and rac-(C₆H₅CH₂NH)P(O)(OC₆H₅)(NH-cyclo-C₆H₁₁) mixed-amide phosphinates

The crystal structures of three new racemic mixed-amide phosphinates are discussed. The compounds crystallize in centrosymmetric space groups and the racemic character is reflected by the symmetry.

Zolmitriptan oxalate and zolmitriptan camphorsulfonate: the first structural study of salt complexes of the anti­migraine drug zolmitriptan

The crystal structures of the oxalate and camphor sulfonate salts of zolmitriptan exhibit two different configurations of the zolmitriptan mol­ecule, which in turn lead to different hydrogen-bonding inter­actions.

Three-dimensional hydrogen-bonded structures in the hydrated proton-transfer salts of isonipecotamide with the di­carb­oxy­lic oxalic and adipic acid homologues

The structures of the 1:1 hydrated proton-transfer compounds of isonipecotamide (piperidine-4-carboxamide) with oxalic acid and adipic acid are three-dimensional hydrogen-bonded constructs involving several different types of enlarged water-bridged cyclic associations.

The six-membered-ring azomethine N-((E)-{5-[(E)-(pyridin-3-yl­imino)­meth­yl]thio­phen-2-yl}methyl­idene)pyridin-3-amine

The title compound was analyzed to compare the crystal structure of six-membered-ring azomethines with the five-membered-ring analogues. The structure is driven by inter­molecular hydrogen bonding and π-stacking inter­actions to give the resulting arrangment in the three-dimensional network.

Dimers linked by type-I C—F⋯F—C contacts in (Z)-3-methyl-4-[2-(4-methyl­phenyl)hydrazinyl­idene]-1-(penta­fluoro­phenyl)-1H-pyrazol-5(4H)-one

In the title compound, there are two independent mol­ecules forming hydrogen- and π-bonded dimeric entities with a noticeable noncrystallographic C₂ symmetry. Dimers are linked by medium-strength type-I C—F⋯F—C inter­actions, forming elongated tetra­mers.