Search

p-Hydroxybenzoic acid (p-HOBA) was selected as the building block for self-assembly with five bases, i.e., diethylamine, tert-butylamine, cyclohexylamine, imidazole and piperazine, and generation of the corresponding acid–base complexes 1–5. Crystal structure analyses suggest that proton-transfer from the carboxyl hydrogen to the nitrogen atom of the bases can be observed in 1–4, while only in 5 does a solvent water molecule co-exist with p--HOBA and piperazine. With the presence of O–H···O hydrogen bonds in 1–4, the deprotonated p-hydroxybenzoate anions (p-HOBAA–) are simply connected each other in a head-to-tail motif to form one-dimensional (1D) arrays, which are further extended to distinct two-dimensional (2D) (for 1 and 4) and three-dimensional (3D) (for 2 and 3) networks via N–H···O interactions. While in 5, neutral acid and base are combined pair-wise by O–H···N and N–H···O bonds to form a 1D tape and then the 1D tapes are sequentially combined by water molecules to create a 3D network. Some interlayer or intralayer C–H···O, C–H···p and p×××p interactions help to stabilize the supramolecular buildings. Melting point determination analyses indicate that the five acid–base complexes are not the ordinary superposition of the reactants and they are more stable than the original reactants.

The title compound, C12H13NO2S, was prepared by the reaction of acetyl­acetone with phenyl isothio­cyanate. In addition to the intra­molecular O—H⋯O hydrogen bond, there is a weak inter­molecular N—H⋯S hydrogen bond, which links the mol­ecules into chains extended along the c axis. The crystal packing is further stabilized by van der Waals forces. [ABSTRACT FROM AUTHOR]

The title compound, C13H12N2OS, was prepared by the reaction of (4-pyrid­yl)methanol with phenyl isothio­cyanate and NaOH in a 1,4-dioxane solution. The asymmetric unit contains two independent mol­ecules. The mol­ecular structure and packing are stabilized by N—H⋯N inter­molecular hydrogen-bond inter­actions and C—H⋯π inter­actions. [ABSTRACT FROM AUTHOR]

In the title compound, [Co(C8H8NO2)2], the Co atom has a distorted square-planar coordination involving two N atoms and two O atoms from two ethanone 1-(2-hydroxy­phen­yl)oximato ligands. The mol­ecular structure and packing are stabilized by intra­molecular O—H⋯O hydrogen bonds and C—H⋯π inter­molecular inter­action. [ABSTRACT FROM AUTHOR]

In the title compound, [Cd(N3)2(C10H8N2)2], the cadmium(II) ion is coordinated by two N atoms from two azide groups and four N atoms from two 2,2′-bi­pyridine ligands. The coordin­ation geometry of the cadmium(II) ion is distorted octahedral. The packing is stabilized by intermolecular C—H⋯N hydrogen-bond interactions. [ABSTRACT FROM AUTHOR]

The title compound, C11H10N6S, was prepared by the reaction of ethyl 2-(1 H-1,2,4-triazol-1-yl)­acetate with hydrazine and phenyl iso­thio­cyanate. The molecular structure and packing are stabilized by an N—H⋯N intermolecular hydrogen-bond and C—H⋯π interactions. [ABSTRACT FROM AUTHOR]

In the title compound, [Co(NCS)2(C4H6N2)2], each cobalt(II) ion is coordinated by two N atoms from two 2-methyl-1 H-imidazole ligands and two N atoms from two iso­thio­cyanate groups. The Co atom lies on a mirror plane and adopts a slightly distorted tetrahedral coordination. The molecular structure and packing are stabilized by intramolecular and intermolecular hydrogen-bond interactions. [ABSTRACT FROM AUTHOR]

The title compound, C9H11N3O2, was prepared by the reaction of 1-(2-nitro­phen­yl)hydrazine with acetone at room temperature. The mol­ecule is approximately planar and exhibits a weak intra­molecular hydrogen-bond inter­action. [ABSTRACT FROM AUTHOR]