Dichloridobis(N,N,N′,N′-tetra­methyl­thio­urea-κS)mercury(II)

In the title compound, [HgCl2(C5H12N2S)2], the HgII atom is located on a twofold rotation axis and is bonded in a distorted tetra­hedral coordination mode to two chloride ions and to two tetra­methyl­thio­urea (tmtu) mol­ecules through their S atoms. The crystal structure is stabilized by C—H⋯N and C—H⋯S hydrogen bonds

Dicyanidobis(thio­urea-κS)cadmium(II) monohydrate

In the title compound, [Cd(CN)2(CH4N2S)2]·H2O, the Cd atom lies on a twofold rotation axis and is bonded to two S atoms of thio­urea and two C atoms of the cyanide anions in a distorted tetra­hedral environment. The crystal structure is stabilized by N—H⋯N(CN), N—H⋯O, O—H⋯N and N—H⋯S hydrogen bonds

1,4-Bis(4-amino­phen­oxy)benzene

The title compound, C18H16N2O2, is a precusor for the synthesis of polyimides. The mol­ecule is located on a crystallographic inversion center and the terminal amino­phen­oxy rings are almost perpendicular to the central benzene ring with a dihedral angle of 85.40 (4)°. The mol­ecular conformation is stabilized by N—H⋯O and N—H⋯N inter­molecular hydrogen-bonding inter­actions

Diiodidobis(N,N,N′,N′-tetra­methyl­thio­urea-κS)cadmium(II)

In the title compound, [CdI2(C5H12N2S)2], the CdII ion is located on a twofold rotation axis and is coordinated in a distorted tetra­hedral mode by two iodide ions and by two tetra­methyl­thio­urea (tmtu) ligands through their S atoms. The crystal structure is stabilized by C—H⋯N and C—H⋯S hydrogen bonds

Racemic methyl 3,10-dioxa-2-aza­tri­cyclo­[6.2.1.02,6]undecane-4-carboxyl­ate

The structure of the racemic title compound, C10H15NO4, consists of a tricyclic skeleton comprising a six-membered piperidine ring and five-membered isoxazolidine and tetra­hydro­furan rings. The piperidine ring adopts a distorted chair conformation, while the isoxazolidine and tetra­hydro­furan rings have envelope conformations

catena-Poly[[[aqua(1,10-phenanthroline-κ2N,N′)zinc]-μ-acetylenedicarboxylato-κ2O1:O2] monohydrate]

In the title complex, {[Zn(C4O4)(C12H8N2)(H2O)]·H2O}n, the pentacoordinated ZnII ion is bound to two N atoms of the 1,10-phenanthroline ligand, two O atoms from two bridging acetylenedicarboxylate anions and a water O atom in a distorted trigonal–bipyramidal geometry. The crystal structure is characterized by polymeric zigzag chains running parallel to [2<-10] and is stabilized by O—H...O hydrogen bonds

μ-2,2′-Bipyrimidine-κ4N1,N1′:N3,N3′-bis[iodido(triphenylphosphane-κP)copper(I)] dimethylformamide disolvate

In the title binuclear centrosymmetric complex, [Cu2I2(C8H6N4)(C18H15P)2]·2C3H7NO, the bis-bidentate 2,2′-bipyrimidine ligand bridges two copper(I) ions, each additionally bound to an iodide anion and a triphenylphosphane ligand in a distorted tetrahedral N2IP geometry. The complex molecules pack in columns parallel to [100] generating cavities occupied by dimethylformamide solvent molecules. Weak C—H...I hydrogen-bonding interactions help to stabilize the crystal packing

One-Dimensional Organic–Inorganic Material (C₆H₉N₂)₂BiCl₅: From Synthesis to Structural, Spectroscopic, and Electronic Characterizations

The new organic–inorganic compound (C6H9N2)2BiCl5 (I) has been grown by the solvent evaporation method. The one-dimensional (1D) structure of the allylimidazolium chlorobismuthate (I) has been determined by single crystal X-ray diffraction. It crystallizes in the centrosymmetric space group C2/c and consists of 1-allylimidazolium cations and (1D) chains of the anion BiCl52−, built up of corner-sharing [BiCl63−] octahedra which are interconnected by means of hydrogen bonding contacts N/C–H⋯Cl. The intermolecular interactions were quantified using Hirshfeld surface analysis and the enrichment ratio established that the most important role in the stability of the crystal structure was provided by hydrogen bonding and H···H interactions. The highest value of E was calculated for the contact N⋯C (6.87) followed by C⋯C (2.85) and Bi⋯Cl (2.43). These contacts were favored and made the main contribution to the crystal packing. The vibrational modes were identified and assigned by infrared and Raman spectroscopy. The optical band gap (Eg = 3.26 eV) was calculated from the diffuse reflectance spectrum and showed that we can consider the material as a semiconductor. The density functional theory (DFT) has been used to determine the calculated gap, which was about 3.73 eV, and to explain the electronic structure of the title compound, its optical properties, and the stability of the organic part by the calculation of HOMO and LUMO energy and the Fukui indices

Fluorescein Hydrazide-Appended Metal–Organic Framework as a Chromogenic and Fluorogenic Chemosensor for Mercury Ions

In this work, we prepared a fluorescein hydrazide-appended Ni(MOF) (Metal–Organic Framework) [Ni3(BTC)2(H2O)3]·(DMF)3(H2O)3 composite, FH@Ni(MOF). This composite was well-characterized by PXRD (powder X-ray diffraction), FT-IR (Fourier transform infrared spectroscopy), N2 adsorption isotherm, TGA (thermogravimetric analysis), XPS (X-ray photoelectron spectroscopy), and FESEM (field emission scanning electron microscopy). This composite was then tested with different heavy metals and was found to act as a highly selective and sensitive optical sensor for the Hg2+ ion. It was found that the aqueous emulsion of this composite produces a new peak in absorption at 583 nm, with a chromogenic change to a pink color visible to the naked eye upon binding with Hg2+ ions. In emission, it enhances fluorescence with a fluorogenic change to green fluorescence upon complexation with the Hg2+ ion. The binding constant was found to be 9.4 × 105 M−1, with a detection limit of 0.02 μM or 5 ppb. This sensor was also found to be reversible and could be used for seven consecutive cycles. It was also tested for Hg2+ ion detection in practical water samples from ground water, tap water, and drinking water