Coordination molecular compounds of cadmium(II) iodide with dimethylpyridines

The reactions of CdI₂ with dimethylpyridines (Me₂Py is C₇H₉N) afford complexes CdI₂(2,3-Me₂Py)₂] (I), [CdI₂(2,6-Me₂Py) (II), and CdI₂(3,5-Me₂Py)₂ (III). The structures of compounds I and II are determined. The crystals of complex I are orthorhombic, space group Pbca, a = 7.930(1) Å, b = 15.537(1) Å, c = 29.943(1) Å, V = 3689.1(5) ų, ρ_calcd = 2.090 g/cm³, Z = 8. The crystals of complex II are monoclinic, space group C2/c, a = 14.784(1), b = 11.991(1), c = 17.711(1) Å, β = 90.39(1)°, V = 1081.1(2) ų, ρ_calcd = 2.908 g/cm³, Z = 4. The structure of compound I is built of discrete neutral complexes [CdI₂(2,3-Me₂Py)₂]. The Cd polyhedron is a distorted tetrahedron (Cd-I 2.289–2.295, Cd-N 2.708–2.734 Å, angles N(I)CdN(I) 103.1°-114.8°). Polymer chains [CdI₂(2,6-Me₂Py)]_∞ extended along the direction [100] are observed due to the bridging iodine atoms in structure II. The Cd polyhedron is a trigonal bipyramid containing iodine atoms at the axial vertices (Cd-I_aks 3.040 Å) and two iodine atoms and the nitrogen atom of the Me₂Py ligand in the equatorial plane Me₂Py (Cd-I_eq 2.840 Å, Cd-N 2.309 Å). The compounds in the solid state are photoluminescent.     

A complex of cadmium(II) iodide with 4-cyanopyridine: Synthesis,crystal structure,and luminescent properties

The complex [CdI₂(4-CNPy)₂] (I) was obtained by a reaction of CdI₂ with 4-cyanopyridine (4-CNPy, C₆H₄N₂) and structurally characterized (CIF file CCDC no. 983377). The crystals of complex I are monoclinic, space group C2, a = 24.698(5) Å, b = 4.127(1) Å, c = 7.597(2) Å, β = 96.05(1)°, V = 770.0(3) ų, ρ_calcd = 2.477 g/cm³, Z = 2. In structure I, iodine atoms serve to unite complex molecules into the polymer chains [CdI₂(4-CNPy)₂]_∞ along the direction [010]. The Cd(1) atom lying on a twofold axis has a slightly distorted octahedral environment made up of four bridging iodine atoms and two nitrogen atoms of two ligands 4-CNPy (Cd-I_av, 2.947(2) and Cd-N(1), 2.410(6) Å). Within each chain, cadmium atoms are spaced apart at 4.13 Å. Complex I exhibits photoluminescence.     

Oxonium derivatives of <Emphasis Type="Italic">closo</Emphasis>-decaborate in reactions with sulfur-containing nucleophiles

The reaction of the [B₁₀H₉O₂C₄H₈]⁻, [B₁₀H₉OC₄H₈]⁻, and [B₁₀H₉OC₅H₁₀]⁻ anions with negatively charged S-nucleophiles, such as SH⁻, SCN⁻, and S₂O₃ ²⁻, resulted in the ring opening of the cyclic substituent and the formation of derivatives with the terminal thiol, thiocyanate, and thiosulfate groups. The structures of the products were confirmed by the IR, mass, and ¹H, ¹¹B, and ¹³C NMR spectra.     

Cadmium Iodide Complex with 4-Aminomethylbenzoic Acid: Synthesis,Crystal Structure,and Luminescent Properties

[СdI₂(4-АmbaH)₂] · H₂O has been synthesized by the reaction between CdI₂ and 4-aminomethylbenzoic acid (4-AmbaH) in an aqueous solution. According to X-ray diffraction data, a 4-AmbaH aromatic molecule crystallizes in the form of a zwitterion with protonation of the NH ₃ ⁺ amino group and deprotonation of the carboxylate group, which is chelately coordinated to the Cd²⁺ ion. In addition to two iodine atoms, the Cd²⁺ atom located on the double crystallographic axis is coordinated to the chelate carboxylate O(1) and O(2) atoms of two crystallographically equivalent ligands 4-AmbaH. The octahedral geometry of the Cd²⁺ ion is strongly distorted due to the chelate addition of 4-AmbaH. The chelate coordination of COO–groups is confirmed by IR spectroscopy data. The complex has luminescent properties.     

A new method of synthesis of the B<Subscript>3</Subscript>H<Stack><Subscript>8</Subscript><Superscript>−</Superscript></Stack> anion

A new method of synthesis of the B₃H₈⁻ anion has been suggested. The method uses the reaction of some metal halides (CuCl, SnCl₂, CrCl₃, PbF₂, PbCl₂, PbBr₂, and BiCl₃) with sodium tetrahydroborate. It is characterized by high (up to quantitative) yields and simplicity of isolation of the target products ((n-C₄H₉)₄N)[B₃H₈] and Cs[B₃H₈].     

Coordination silver polymer with the bridging anion of oxadiazolylacrylic acid: Synthesis,crystal structure,and luminescence properties

Metal complex [AgL] (I) is synthesized by the reaction of AgNO₃ with 3-(5-furyl-1,3,4-oxadiazol-2-yl)acrylic acid (HL, C₉H₆N₂O₄), and its crystal structure is determined (CIF file CCDC no. 1426528). The crystals are monoclinic, space group P2₁/n, a = 4.946(1), b = 20.084(1), c = 9.015(1) Å, β = 92.32(1)°, V = 894.482 ų, ρ_calcd = 2.442 g/cm3, Z = 4. In structure I, pairs of centrosymmetric silver atoms are bound by bidentate-bridging oxygen atoms of two anions L into dimeric blocks. The Ag–Ag distance in the dimer is 2.854(1) Å. The coordination sphere of Ag⁺ contains two oxygen atoms, one silver atom, and one nitrogen atom of the diazolyl fragment of the adjacent anion. The coordination polyhedron of Ag⁺ is a strongly distorted tetrahedron. The molecular packing of crystal I is built of infinite ribbons (AgL)n extended along the direction [001]. The photoluminescence spectrum of compound I contains intense bands about 550 nm corresponding to the green spectral range and less intense bands at 425 and 485 nm.     

Supramolecular ensembles with intermolecular hydrogen bonds: The synthesis and structure of (H2Phda)[SnF3]2 and (H2Bipy)[SnF6]

The structures of the compounds (H₂Phda)[SnF₃]₂ (I) and (H₂Bipy)[SnF₆] (II) have been determined. The main structural elements of I are anionic ([SnF₃] _n ^n? ) polymer chains and 1,4-phenylenediamine ([C₆H₄(NH₃)₂]²⁺) cations. The coordination polyhedron of Sn²⁺ is a trigonal bipyramid with a stereochemically active lone pair in the equatorial plane. The [SnF₃E] _n ^n? chains are crosslinked by phenylenediamine cations through N-H...F hydrogen bonds, resulting in supramolecular ensembles. The structure of II is built of separate [SnF₆]^2? complexes and 4,4′-bipyridinium ((C₁₀H₁₀N₂)²⁺) cations linked by bifurcate N-H...F hydrogen bonds. These bonds combine the [SnF₆]^2? complexes into supramolecular layers alternating along the [100] direction with a period of 1/2a.     

Formation of New Unusual Cadmium Polymer with Bridging Thiocyanate Ions

Russian Journal of Coordination Chemistry - The reaction of cadmium thiocyanate with 2-(methylamino)pyridine (2-Map) in an ethyl alcohol solution gave a new unusual coordination polymer...