Analysis of the coordination of the Sn to the indenyl ring shows that the Sn inter­acts in an η² fashion. A database survey showed that whilst this coordination mode is unusual for Ge and Pb compounds, Sn displays a wider range of coordination modes to cyclo­penta­dienyl ligands and their derivatives.

The crystal structures of two chromium(II) acetate complexes with N-heterocyclic carbene coligands were determined.

The thermal stability and solubility of chalcones increase with the number of heterocyclic rings which are present in the structure. (E)-1-(1H-Pyrrol-2-yl)-3-(thio­phen-2-yl)prop-2-en-1-one and (E)-3-phenyl-1-(1H-pyrrol-2-yl)prop-2-en-1-one are compared with trans-chalcone, also known as (2E)-1,3-di­phenyl­prop-2-en-1-one.

The current study demonstrates the cocrystallization of pyrazinamide with homophthalic acid employing the reflux method, and the cocrystallization of the commercially available heterocyclic drug carbamazepine with 5-chloro­salicylic acid, trans-cinnamic acid and nicotinamide. The synthesized cocrystals were characterized by FT–IR, PXRD and SC-XRD techniques, followed by thermal stability studies based on DSC and TGA analysis.

Utilizing the N-heterocyclic chalcogenones hexa­hydro-1,3-bis­(2,4,6-tri­methyl­phenyl)-2H-1,3-diazepine-2-thione (SDiazMesS) and hexa­hydro-1,3-bis­(2,4,6-tri­methyl­phenyl)-2H-1,3-diazepine-2-selone (SDiazMesSe) as halogen-bond acceptors, 24 new cocrystals were prepared. The solid-state structures of the parent molecules were also determined, along with those of their aceto­nitrile solvates.

A new neutral triazole-based N-heterocyclic carbene rhodium(I) complex [RhCl(C₈H₁₂)(C₈H₁₅N₃)], has been synthesized and structurally characterized. The complex crystallizes with two mol­ecules in the asymmetric unit. The rhodium center has a distorted square-planar conformation, formed by a cyclo­octa-1,5-diene (COD) ligand, an N-heterocyclic carbene (NHC) ligand, and a chloride ligand.

The title compound represents the first reported example of a [1,3]oxatellurole, prepared in three steps from 3,4-di­methyl­phenol. Both independent mol­ecules are folded along their TeO axes, with an average angle φ = 25.1° between the Te–C–O planes and the remaining non-hydrogen atoms. A Hirshfeld plot indicates a weak inter­molecular inter­action between the two tellurium atoms in the asymmetric unit.

The synthesis and crystal structure of a new triazole-based N-heterocyclic carbene iridium(I) cationic complex with a tetra­fluorido­borate counter-anion and solvating di­chloro­methane is reported. The IrI center of the cationic complex has a distorted square-planar conformation, formed by a bidentate cyclo­octa-1,5-diene (COD) ligand, an N-heterocyclic carbene, and a tripheylphosphane ligand. There are weak hydrogen-bonding inter­actions between C—H groupings of the iridium complex and F atoms of the [BF₄]⁻ counter-ions.

The central Ir^I atom of the cationic complex of the title compound, [Ir(C₈H₁₂)(C₁₈H₁₅P)(C₆H₁₁N₃)][BF₄] ·0.8CH₂Cl₂, exhibits a distorted square-planar coordination environment.

A series of 18 cocrystals were obtained through the combination of the heterocyclic mol­ecules imidazolidine-2-thione, 2-mercaptobenzimidazole, 2-mercapto-5-methyl­benz­imidazole, 2-mercaptobenzoxazole, and 2-mercaptobenzo­thia­zole with the common halogen-bond donors 1,2-, 1,3-, and 1,4-di­iodo­tetra­fluoro­benzene, 1,3,5-tri­fluoro­tri­iodo­benzene, and tetra­iodo­ethyl­ene. A rich series of hydrogen-, halogen-, and chalcogen-bonding inter­actions were observed.