Two phases of bis­(tetraethyl­ammonium) di‐μ‐chloro‐bis­[di­chloro­palladium(II)]

A phase transition was found to occur at ∼153 K in the title compound, (C₈H₂₀N)₂[PdCl₆]. The structures of the two phases are reported at 292 and 130 K. The low‐temperature phase is twinned. The phase transition is accompanied by a minor displacement of the ions. There are C—H⋯Cl interactions as short as ∼2.80 Å, indicating the existence of hydrogen bonds, and this was confirmed by vibrational spectroscopy. The [Pd₂Cl₆]²⁻ anion occupies sites of mmm and 2/m symmetry in the room‐temperature and low‐temperature phases, respectively.     

Bis(dihydronium) naphthalene‐1,5‐disulfonate

The title compound is a salt, 2H₅O₂⁺·C₁₀H₆O₆S₂²⁻, in which the anion lies across an inversion centre in the space group C2/c, while the cation contains a short but noncentred O—H...O hydrogen bond. The ionic components are linked by charge‐assisted O—H...O hydrogen bonds into a three‐dimensional framework structure.     

1,1′‐(Ethenyl­idene)bis­(4‐chloro­benzene)

The title compound, C₁₄H₁₀Cl₂, crystallizes as colourless prisms with two symmetry‐independent mol­ecules in the unit cell. Numerous inter­molecular C—H⋯π inter­actions dominate in the crystal structure, where C—H⋯Cl and long Cl⋯Cl contacts are also observed.     

1,5‐Diphenyl‐4,8‐bis­(3‐phenyl­pyrazol‐1‐yl)pyraza­bole

The six‐membered B₂H₄ ring of the title compound, C₃₆H₃₀B₂N₈, adopts a slightly distorted boat conformation, with the terminal B substituents in a trans orientation. One 3‐­phenyl­pyrazolyl group is in an equatorial position, whereas the second is in an axial position with respect to the plane defined by the B atoms.     

Hierarchy of hydrogen bonding in bis­(1,4,7‐trioxa‐10‐azoniacyclo­dodecane) bis­(4‐amino­benzoate) trihydrate

In the title compound, 2C₈H₁₈NO₃⁺·2C₇H₆NO₂⁻·3H₂O, proton transfer occurs from the carboxylic acid group of the 4‐amino­benzoic acid (PABA) mol­ecule to the amine group of the macrocycle, resulting in the formation of a salt‐like adduct. The anions are combined into helical chains which are further bound by the water mol­ecules into sheets. The macrocyclic cations are situated between these layers and are bound to the anions both directly and via bridging water mol­ecules. The structure exhibits a diverse system of hydrogen bonding.     

Two crystals of doubly protonated melaminium salts: melaminium bis­(trifluoro­acetate) trihydrate and melaminium bis­(trichloro­acetate) dihydrate

Crystals of 2,4,6‐triamino‐1,3,5‐triazine‐1,3‐dium bis­(trifluoro­acetate) trihydrate, C₃H₈N₆²⁺·2CF₃COO⁻·3H₂O, and 2,4,6‐triamino‐1,3,5‐triazine‐1,3‐dium bis­(trichloro­acetate) dihydrate, C₃H₈N₆²⁺·2CCl₃COO⁻·2H₂O, both contain doubly protonated melamine rings that lie on crystallographic twofold axes. In the former structure, one water mol­ecule also lies on a twofold axis. While the trifluoro­acetate compound crystallizes in a centrosymmetric space group, the trichloro­acetate is non‐centrosymmetric, so it is useful as a material for non‐linear optics. The efficiency of second harmonic generation is about three times greater than that of KDP (KH₂PO₄). A combination of ionic and donor–acceptor hydrogen‐bond inter­actions link the melaminium(2+) residues with trifluoro­acetate or trichloro­acetate ions and water mol­ecules to form a three‐dimensional network.     

Butane‐1,4‐diyl bis­(chloro­acetate)

The title compound, C₈H₁₂Cl₂O₄, lies about an inversion centre. The molecular conformation is characterized by a conformation for the butane­dioxy moiety and a trans conformation for the ClCH₂—C(=O)O bond. The molecular packing is stabilized by a network of weak CH₂⋯O=C intermolecular hydrogen bonds, where each mol­ecule interacts with its four closest neighbours.     

Bis­(pentane‐1,5‐di­ammonium) deca­iodo­triplumbate(II)

The title compound, {(NH₃C₅H₁₀NH₃)₂[Pb₃I₁₀]}_n, crystallizes as an organic–inorganic hybrid. As such, the structure consists of extended chains of [Pb₃I₁₀]_n⁴ⁿ⁻ ions extending along [111]. The asymmetric unit contains two independent Pb atoms: one is in a general position and the other is on an inversion centre. Each Pb atom is octahedrally coordinated by six iodide ions and exhibits both face‐ and edge‐sharing with adjacent atoms in the inorganic chain. The organic counter‐ion, viz. pentane‐1,5‐di­ammonium, lies in channels formed by the chains and interacts with these chains via N—H⋯I hydrogen bonding.     

Bis[bis­(methoxy­carbimido)amine‐κ2N,N′]bis­(perchlorato‐κO)copper(II) bis­[bis­(methoxy­carbimido)amine‐κ2N,N′]bis­(methanol‐κO)copper(II) bis­(perchlorate) methanol disolvate

The title compound, [Cu(ClO₄)₂(C₄H₉N₃O₂)₂][Cu(C₄H₉N₃O₂)₂(CH₄O)₂](ClO₄)₂·2CH₃OH, comprises two independent Cu^II species lying on different inversion sites. In the Cu complexes, a distorted octa­hedral geometry arises (from basic square‐planar N₄ coordination) from the weak coordination of two perchlorate ions (as Cu—O) in one species and two methanol mol­ecules in the other (also as Cu—O). Inter­actions between the O atoms of the perchlorate anions or methanol groups and the imide or amine NH groups afford an extensive inter­molecular hydrogen‐bonding network.     

Two hydrates of 2,6‐bis­(1H‐benzimidazol‐2‐yl)­pyridine

The structures of the mono‐ and sesquihydrates of 2,6‐bis(1H‐benz­imi­da­zol‐2‐yl)­pyridine (bbip) are reported. Phase (I), C₁₉H₁₃N₅·H₂O, has one water and one bbip mol­ecule in the asymmetric unit, while phase (II), C₁₉H₁₃N₅·1.5H₂O, has three water mol­ecules and two bbip mol­ecules in the asymmetric unit. The compounds exhibit very similar molecular geom­etries but different packing organizations, which result from intricate hydrogen‐bonding schemes.     

Poly­[disilver(I)‐μ8‐1,5‐naphthalene­disulfonato]

The title complex, poly­[disilver(I)‐μ₈‐1,5‐naphthalene­di­sulfon­ato‐3,4‐η:7,8‐η:κ⁶O:O′:O′′:O′′′:O′′′′:O′′′′′], [Ag₂(C₁₀H₆O₆S₂)]_n, exists as a three‐dimensional framework of Ag^I atoms connected by η¹⁰,μ₈‐1,5‐naphthalene­di­sulfonate ligands through both Ag–sulfonate and Ag–η²‐arene interactions. Each Ag^I atom exhibits a distorted tetrahedral geometry defined by three O atoms of independent sulfonate groups and one C=C bond of the naphthalene group.     

Bis(1‐phenyl­ethyl­ammonium) hexa­chloridostannate(IV) and bis­(2‐phenyl­ethyl­ammonium) hexa­chloridostannate(IV)

The crystal structures of the two isomers bis­(1‐phenyl­ethyl­ammonium) hexa­chloridostannate(IV) and bis­(2‐phenyl­ethyl­ammonium) hexa­chloridostannate(IV), both (C₈H₁₂N)₂[SnCl₆], exhibit alternating organic and inorganic layers, which inter­act via N—H⋯Cl hydrogen bonding. The inorganic layer contains an extended two‐dimensional hydrogen‐bonded sheet. The Sn atom in the 1‐phenylethyl­ammonium salt lies on an inversion centre.     

Bis[bis­(3‐phenyl­pyrazol‐1‐yl)­(pyrazol‐1‐yl)­methane]­copper(II) bis­(per­chlor­ate) acetonitrile disolvate

The title copper(II) complex, [Cu(C₂₂H₁₈N₆)₂](ClO₄)₂·2C₂H₃N, comprises two neutral substituted tris­(pyrazol‐1‐yl)­methane ligands bonded to a central Cu^II ion, which is positioned on a crystallographic inversion center. Six Cu—N bonds are arranged in a distorted octa­hedral fashion. The unsubstituted pyrazole rings on each ligand are oriented trans with respect to each other, inter­digitated with the two 3‐phenyl­pyrazole rings of the other ligand.     

catena‐Poly[bis­(tert‐butyl­ammonium) [plumbate(II)‐tri‐μ‐iodo] iodide dihydrate]

The title compound, {(C₄H₁₂N)₂[PbI₃]I·2H₂O}_n, crystallizes as an organic–inorganic hybrid. The six‐coordinate Pb atom lies on a centre of inversion and all the I atoms lie on mirror planes; the two independent cations both lie across mirror planes. The structure contains anionic chains along [100] of fused [PbI₃]⁻ units forming face‐sharing octa­hedra. Four cations enclose channels occupied by isolated iodide ions and water mol­ecules of hydration.     

(6,7‐Dimethyl‐2,3‐di‐2‐pyridyl­quinoxaline)bis­(3‐methyl­pyridine)­platinum(II) bis­(hexa­fluoro­phosphate) acetone solvate 0.5‐hydrate

The crystal structure of the title compound, [Pt(C₆H₇N)₂(C₂₀H₁₆N₄)](PF₆)₂·C₃H₆O·0.5H₂O, is composed of a bivalent square‐planar platinum(II) complex, two PF₆⁻ counter‐ions and solvent mol­ecules. The di‐2‐pyridylquinoxaline ligands are known to confer an `L shape' on square‐planar platinum(II) complexes, which also display inter­calating properties. The structural characterization reported here is a contribution to a wide‐ranging study focused on structural and dynamical analyses of these substrates, which may provide better insight into their biological mechanisms and activities. The expected `L‐shaped' skeleton of the metallic complex combined with the antiparallel orientation of substituted pyridines (anti conformation) generates chiral objects, found in the solid state as a racemic mixture.     

N‐(2‐Amino­benz­yl)‐N,N‐bis­(quinolin‐2‐ylmeth­yl)amine

The title new diquinaldine derivative, C₂₇H₂₄N₄, forms mol­ecular assemblies organized by inter­molecular quinoline π–π stacking [3.356 (3) and 3.440 (3) Å] and both inter‐ and intra­molecular N—H⋯N hydrogen bonds [3.039 (3)–3.104 (3) Å and 129 (2)–172 (2)°]. The combination of such inter­actions provides readily definable contacts that propagate along each crystallographic axis.     

A linear Fe–O–Fe unit in bis­(dibenzyl­dimethyl­ammonium) μ‐oxo‐bis­[tribromo­ferrate(III)]

The title compound, (C₁₆H₂₀N)₂[Fe₂Br₆O], crystallizes with one dibenzyl­dimethylammonium cation and one half of a μ‐oxo‐bis­[tribromo­ferrate(III)] anion in the asymmetric unit. The bridging oxo group is situated on an inversion centre, resulting in a linear conformation for the Fe—O—Fe unit. The iron(III) cations have tetra­hedral geometry, with bond angles in the range 106.8 (1)–112.2 (1)°. The ion pairs are held together by Coulombic forces and C—H⋯Br hydrogen bonds. Each Br⁻ anion forms one hydrogen bond. No C—H⋯O hydrogen bonds are found between the O atom in the Fe—O—Fe unit and surrounding counter‐cations, consistent with the linear configuration of the Fe—O—Fe unit.     

l‐Argininamidium bis­(hydrogen­squarate)

Cations and anions of the title compound {systematic name: 1‐[4‐(amino­carbonyl)butyl]guanidinium bis­(hydrogen­squarate)}, C₆H₁₇N₅O²⁺·2C₄HO₄⁻, are connected into a three‐dimensional network by inter­molecular N—H⋯O hydrogen bonds between the l ‐argininamidium ammonium, amide and guanidinium functions and the hydrogensquarate carbonyl O atoms. The independent hydrogensquarate monoanions are linked into dimers by pairs of O—H⋯O′ hydrogen bonds.     

Inhibition of a palladium(II) catalyst upon formation of a di‐μ‐chloro complex: di‐μ‐chloro‐bis­[1,2‐bis­(di­phenyl­phosphino)­ethane‐P,P′]dipalladium(II) bis­(tetra­fluoro­borate) bis­(deutero­chloro­form) solvate

The title compound was formed upon slow evaporation of a solution of the solvated dicationic complex bis­(aceto­nitrile)­bis­[1,2‐bis­(di­phenyl‐phosphino)­ethane]­palladium(II) bis(tetra­fluoro­borate) in deuterated chloro­form. The dinucleur palladium complex forms triclinic crystals and there is an inversion center between the Pd atoms. Compared to the corresponding monomeric compound, the Cl—Pd—Cl angles decrease upon briding from 94.19 (7) to 86.96 (4)°.     

trans‐Bis(3,5‐di­aza‐1‐azonia‐7‐phosphaadamantane‐κP)­bis­(thiocyanato‐κS)­palladium(II) bis­(thio­cyanate)

The crystal structure of the title compound, trans‐[Pd(NCS)₂(C₆H₁₃N₃P)₂](NCS)₂, is one of the few pal­ladium(II) complexes containing two protonated water‐soluble 1,3,5‐tri­aza‐7‐phos­pha­adamantane (PTA) ligands re­ported to date. The compound displays a distorted square‐planar geometry, with the Pd atom on an inversion centre and with the S atoms of the thio­cyanate counter‐ions occupying the axial positions above and below the equatorial plane described by the phosphine and thio­cyanate ligands. Geometric parameters for the formal coordination polyhedron include a Pd—P distance of 2.2940 (8) Å, a Pd—S distance of 2.3509 (8) Å and a P—Pd—S angle of 89.45 (3)°. The effective cone angle for the PTA ligands was calculated as 114.5°.