A novel copper(I) sulfamate π-complex based on the 5-(allylthio)-1-(3,5-dimethylphenyl)-1H-tetrazole ligand: Alternating-current electrochemical crystallization, DFT calculations, structural and NLO properties studies

Syntheses and crystal structures of two copper(I)-halide π,σ-coordination compounds based on 2-[(prop-2-en-1-yl)sulfan-yl]pyridine

The title compounds, di-μ-chlorido-bis-({2-[(η-2,3)-(prop-2-en-1-yl)sulfan-yl]pyridine-κN}copper(I)), [Cu2Cl2(C8H9NS)2], and di-μ-bromido-bis-({2-[(η-2,3)-(prop-2-en-1-yl)sulfan-yl]pyridine-κN}copper(I)), [Cu2Br2(C8H9NS)2], were obtained by alternating-current electrochemical synthesis starting from an ethano-lic solution of 2-[(prop-2-en-1-yl)sulfan-yl]pyridine (Psup) and the copper(II) halide. The isostructural crystals are built up from centrosymmetric [Cu2 Hal 2(Psup)2] dimers, which are formed due to the π,σ-chelating behavior of the organic ligand. In the crystals, the dimers are linked by C-H⋯Hal hydrogen bonds as well as by aromatic π-π stacking inter-actions into a three-dimensional network.

Synthesis, structure and computational study of 5-[(prop-2-en-1-yl)sulfanyl]-1,3,4-thiadiazol-2-amine (Pesta) and its heterometallic π,σ-complex [Cu2FeCl2(Pesta)4][FeCl4]

Copper(I) π-coordination compounds with allyl derivatives of azoles are an interesting subject of current research, but Cu^I π-complexes with other transition-metal ions incorporated in the structure have been virtually uninvestigated. The present work is directed toward the synthesis and structural characterization of the novel heterometallic Cu^I/Fe^II π-complex di-μ₂-chlorido-1:2κ²Cl;2:3κ²Cl-tetrakis[μ₂-5-(prop-2-en-1-ylsulfanyl)-1,3,4-thiadiazol-2-amine]-1:2κ²N⁴:N³;1(η²),κN⁴:2κN³;2:3κ²N³:N⁴;2κN³:3(η²),κN⁴-dicopper(I)iron(II) tetrachloridoferrate(II), [Cu₂FeCl₂(C₅H₇N₃S₂)₄][FeCl₄] (1). The structure of the 5-[(prop-2-en-1-yl)sulfanyl]-1,3,4-thiadiazol-2-amine (Pesta, C₅H₇N₃S₂) ligand is also presented. The cationic substructure in 1 consists of one Fe^II and two Cu^I ions bridged by two chloride ions along with two σ,σ- and two π,σ-coordinated ligands, whereas the anionic part is built of isolated tetrahedral [FeCl₄]^2- ions. π-Coordination of the Pesta allyl group to the Cu^I ions prevents agglomeration of the inorganic Cu-Cl-Fe-Cl-Cu part into infinate chains. An energy framework computational analysis was performed for Pesta.

Crystal structure and enantiomeric layer disorder of a copper(I) nitrate π-coordination compound

The novel π-coordination compound [CuI(m-dmphast)NO3], where m-dmphast = 5-(allylthio)-1-(3,5-dimethylphenyl)-1H-tetrazole, is characterized using single-crystal X-ray diffraction and crystallizes in a noncentrosymmetric space group. Additionally, for the first time in this group of materials, the streaks of X-ray diffuse scattering in the reciprocal space sections were observed and described. This gave the possibility for a deeper insight into the local structure of the title compound. The conjecture about the origin of diffuse scattering was derived from average structure solution. It was then confirmed using the local structure modelling. The extended [Cu(m-dmphast)NO3]∞ chains, connected by weak interactions, produce layers which can exist in two enantiomeric forms, one of which predominates.

Crystal structure, Hirshfeld surface analysis and computational studies of 5-[(prop-2-en-1-yl)sulfan-yl]-1-[2-(tri-fluoro-meth-yl)phen-yl]-1H-tetra-zole

The title compound, C11H9F3N4S, was synthesized from 2-(tri-fluoro-meth-yl)aniline by a multi-step reaction. It crystallizes in the non-centrosymmetric space group Pna21, with one mol-ecule in the asymmetric unit, and is constructed from a pair of aromatic rings [2-(tri-fluoro-meth-yl)phenyl and tetra-zole], which are twisted by 76.8 (1)° relative to each other because of significant steric hindrance of the tri-fluoro-methyl group at the ortho position of the benzene ring. In the crystal, very weak C-H⋯N and C-H⋯F hydrogen bonds and aromatic π-π stacking inter-actions link the mol-ecules into a three-dimensional network. To further analyse the inter-molecular inter-actions, a Hirshfeld surface analysis, as well as inter-action energy calculations, were performed.