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The reaction of the Schiff base 2-[1-(pyridin-2-yl)ethylideneamino]ethanol (HL), which is formed by reaction of 2-aminoethanol and 2-acetylpyridine with CuBr2 in ethanol results in the isolation of the new polymeric complex poly[hexa-μ-bromido-bis{2-[1-(pyridin-2-yl)ethylideneamino]ethanolato}tetracopper(II)], [Cu4Br6(C9H11N2O)2]n or [Cu4Br6L2]n. The asymmetric unit of the crystal structure of the polymeric [Cu4Br6L2]n complex is composed by four copper (II) cations, two monodeprotonated molecules of the ligand, and six bromide anions, which act as bridges. The ligand molecules act in a tridentate fashion through their azomethine nitrogen atoms, their pyridine nitrogen atoms, and their alcoholate O atoms. The crystal structure shows two types of geometries in the coordination polyhedrons around Cu2+ ions. Two copper cations are situated in a square-based pyramidal environment, while the two other copper cations adopt a tetrahedral geometry. Bromides anions acting as bridges between two metal ions connect the units, resulting in a tetranuclear polymer compound.

In the title salt, (C8H20N)8[Mo10O34], the [Mo10O34]8− polyanion is located about an inversion centre and can be considered as a β-type octamolybdate anion to which two additional MoO4 tetrahedra are linked via common corners. The [Mo10O34]8− polyanions are packed in rows extending parallel to [001] and are connected to the dibutylammonium counter-cations through N—H...O hydrogen-bonding interactions.

The title salt, C14H16N+·C6H7AsNO3−·H2O or [(C6H5CH2)2NH2][H2NC6H4As(OH)O2]·H2O, (I), was synthesized by mixing an aqueous solution of (4-aminophenyl)arsonic acid with an ethanolic solution of dibenzylamine at room temperature. Compound I crystallizes in the monoclinic P21/c space group. The three components forming I are linked via N—H...O and O—H...O intermolecular hydrogen bonds, resulting in the propagation of an infinite zigzag chain. Additional weak interactions between neighbouring chains, such as π–π and N—H...O contacts, involving phenyl rings, –NH2 and –As(OH)O3 functions, and H2O, respectively, lead to a three-dimensional network.

Six new phenylarseniato adducts and derivatives containing SnR3 (R = Bu, Ph) residue have been synthesized and studied by infrared spectroscopy. The suggested structures are discrete, the anion behaving as a bi- or tri- dentate ligand. When the cation is involved through hydrogen bonds, supramolecular architectures are obtained.

Four new phenylarseniato adducts and derivatives have been synthesized on allowing SnR2Cl2 (R = Ph, Bu) to react with Cy2NH2.NH2PhAsO3H.3/2H2O in specific ratios. The obtained new tin (IV) compounds were studied by infrared, infinite chain and discrete structures were suggested on the basis of spectroscopic data, the oxyanion behaving as a bridging bidentate or a tridentate ligand. When secondary interactions are involved supramolecular architectures were obtained.

Five new (Me4N)(NO2)2C6H3CO2 adducts with MCl2 (M = Zn, Co, Cd) and SnR3Cl (R = Me, Ph) have been synthesized and studied by infrared spectroscopy. The suggested structures are discrete, the anion behaving as mono- and bichelating ligand towards MX2, tri- and monodentate towards SnR3Cl (R = Me, Ph).The environment around Zn, Co and Cd is tetrahechal, while the tin (IV) centre is trigonal bipyramidal.

Four new phenylarseniato adducts and organotin derivatives have been synthesized and studied by infrared. The suggested structures are polymeric, (SnX4; X = Cl, Br) and SnPh3Cl while being discrete for SnPh2Cl(PhAsO3H)2isoBu2NH2. When OH- - - Cl, NH - - - O or NH- - -Cl hydrogen bonds are involved, supramolecular architectures are obtained.

The crystal structure of the title salt, (C25H22P)[Sn(C6H5)3Cl2] or (PhCH2PPh3)[SnPh3Cl2], consists of [PhCH2PPh3]+ cations and [SnPh3Cl2]− anions in which the SnIV atom is linked to two Cl atoms and three phenyl groups in a trigonal–bipyramidal geometry, with the Cl atoms in trans positions. The cation adopts a tetrahedral geometry. In the crystal, the cations and the anions are connected by C—H...Cl hydrogen bonds, leading to an infinite chain propagating along the c direction.