Cation-Cation Interaction in Np(V) Perchlorates and Their Electronic Absorption Spectra.

Four new Np(V) perchlorate complexes of the composition [NpO(HO)]ClO (orthorhombic) (), [(NpO)(ClO)(HO)]ClO·HO (), [(NpO)(UO)(HO)](ClO) (), and [(NpO)Cl(HO)]ClO·2HO () have been synthesized and structurally characterized. The structure of previously known monoclinic modification of NpOClO·4HO () has been determined at 100 K. The coordination environment of Np and U atoms in compounds - is pentagonal bipyramids.

Odd-Numbered Ring Cluster Tc(μ-O)Cl(OOCCCl): Synthesis, Crystal Structure, and Optical and Thermal Properties.

Herein, we report a method for the preparation of the first odd homometallic and heterovalent nine-centered Tc wheel, [Tc(μ-O)Cl(OOCCl)]. The synthesized compound represents the pioneering instance of such clusters among d elements and is the fourth instance observed across all metals. The ring was synthesized by a solvothermal method in a solution of technetium acid in trichloroacetic anhydride.

Effective self-assembly of 21- and 14-membered azamacrocycles condition-controlled cyclotrimerization or cyclodimerization of different thiosemicarbazide-based precursors.

A preparative synthesis of previously unknown 21- and 14-membered azamacrocycles acid-promoted cyclotrimerization or cyclodimerization of three readily available precursors, namely, 1-amino-6-hydroxy-4,6-dimethylhexahydropyrimidine-2-thione, 4-(4-oxopent-2-yl)thiosemicarbazide hydrazone, and 5,7-dimethyl-1,4,5,6-tetrahydro-3-1,2,4-triazepine-3-thione has been developed. A dramatic dependence of the selectivity of macrocyclization on the reaction conditions is demonstrated. The thermodynamic aspects of the reactions are discussed based on experimental data and DFT calculation results.

Crystal structure and Hirshfeld surface analysis of 1-[6-bromo-2-(3-bromo-phen-yl)-1,2,3,4-tetra-hydro-quinolin-4-yl]pyrrolidin-2-one.

This study presents the synthesis, characterization and Hirshfeld surface analysis of 1-[6-bromo-2-(3-bromo-phen-yl)-1,2,3,4-tetra-hydro-quinolin-4-yl]pyrrolidin-2-one, CHBrNO. In the title compound, the pyrrolidine ring adopts a distorted envelope configuration. In the crystal, mol-ecules are linked by inter-molecular N-H⋯O, C-H⋯O and C-H⋯Br hydrogen bonds, forming a three-dimensional network.

Syntheses and Patterns of Changes in Structural Parameters of the New Quaternary Tellurides EuCuTe ( = Ho, Tm, and Sc): Experiment and Theory.

The layered orthorhombic quaternary tellurides EuCuTe ( = Ho, Tm, Sc) with symmetry were first synthesized. Single crystals of the compounds up to 500 μm in size were obtained by the halide-flux method at 1120 K from elements taken in a ratio of Eu//Cu/Te = 1:1:1:3. In the series of compounds, the changes in lattice parameters were in the ranges = 4.