Reactions of manganese and zinc iodides with formamide in aqueous solution

Large interaction energy for the homodimer and the heterodimer extracted from the supramolecular chain of a bent trinuclear zinc(ii) complex with a reduced Schiff base ligand

The coordinated amino groups in a trinuclear zinc complex participate in strong H-bonding interactions that have been analysed. The dimerization energy is very large for both the homodimer and the heterodimer in the 1D supramolecular chain.

Crystal structures and hydrogen-bonding analysis of a series of benzamide complexes of zinc(II) chloride

Ionic co-crystals are co-crystals between organic mol-ecules and inorganic salt coformers. Co-crystals of pharmaceuticals are of inter-est to help control polymorph formation and potentially improve stability and other physical properties. We describe the preparation, crystal structures, and hydrogen bonding of five different 2:1 benzamide or tolu-amide/zinc(II) chloride co-crystal salts, namely, bis-(benzamide-κO)di-chlorido-zinc(II), [ZnCl2(C7H7NO)2], di-chlor-ido-bis-(2-methyl-benzamide-κO)zinc(II), [ZnCl2(C8H9NO)2], di-chlorido-bis-(3-methyl-benzamide-κO)zinc(II), [ZnCl2(C8H9NO)2], di-chlorido-bis-(4-methyl-benzamide-κO)zinc(II), [ZnCl2(C8H9NO)2], and di-chlorido-bis-(4-hy-droxy-benzamide-κO)zinc(II), [ZnCl2(C7H7NO2)2]. All of the complexes contain hydrogen bonds between the amide N-H group and the amide carbonyl oxygen atoms or the chlorine atoms, forming extended networks.

Using vibrational and electronic spectroscopies to investigate different complexes in the formamide/nickel chloride system

Raman, IR and UV-vis-NIR experiments of formamide (FA) and nickel chloride solutions at different compositions were carried out. The quantitative Raman study at the νCN region shows that 5 FA molecules are coordinated to Ni (II) and the sixth position of the octahedron is occupied by one chloride, with preferential formation of [Ni(FA)5Cl]Cl in concentrations near 0.1 mol kg(-1). In higher concentrations the [Ni(FA)4Cl2] complex becomes the most abundant. The downshift of the νCO mode of FA was evidenced by the appearance of a new band at 1640 cm(-1) in the IR spectra of the most concentrated salt solutions. Also, the downshift of the δOCN mode combined with the upshift of the νCN vibration have allowed us realize that Ni (II) is coordinated by the O atom of FA. The d orbital splitting (Δo) has been directly determined from the electronic spectrum of the [Ni(FA)6]Cl2 complex and FA has been included in the spectrochemical series.