Synthesis of new spiropyranes and study of the effect of the nature of substituents on their photochromism and complexation

A series of new hydrazones based on 3,3-dimethyl-7-hydroxy-8-formyl-[2H]-1-benzopyran-2,1-[2]-oxaindane] with the substituents of different nature in the hydrazone moiety was synthesized. A comparative study of photochromism and complexation of the synthesized spiropyrans with a number of metal cations was carried out. Spectral and kinetic differences in photochromism and complexation of these compounds were revealed.     

Tetranuclear copper(II) complex with the µ<Subscript>4</Subscript>-1,6-hexadicarboxylate linker: crystal structure and magnetic properties

Tetranuclear copper(II) complex [Cu₄L₂(OOC(CH₂)₆COO)] (I) based on bis(azomethine), condensation product of 1-phenyl-3-methyl-4-formylpyrazolone-5 with 1,3-diaminopropanol-2, is synthesized. The structure of its DMSO-adduct (Ia) is determined by X-ray diffraction analysis (CIF file CCDC 1447891). The complexes contain two binuclear fragments bonded by the µ₄-1,6-hexadicarboxylate linker. The magnetic exchange interaction in complex I is antiferromagnetic (2J =–155 cm^–1), whereas that in complex Ia is ferromagnetic (2J = 129 cm^–1), which is due to different conformations of the metallochelate cycles.     

An Analysis of Vibrations and Rotations in the First Hydrogen Sulfide Hexade: the 4ν2 H $$_{2}^{{32}}$$ S Band

Optics and Spectroscopy - The infrared spectrum of the H2S molecule is recorded using a Bruker IFS 125HR Fourier transform spectrometer and studied in the range of 4500–5000 cm–1, in...     

Global Analysis of 24 Rovibrational Bands of the Octad of the 76GeH4 Molecule

Russian Physics Journal - A global fitting method has been developed for spherical top molecules. The octad of the GeH4 molecule comprising 24 interacting states has been investigated. By solving...     

Structure of the Planar Acetate-Bridged Binuclear Copper(II) Complex Based on 1,3-Bis(3-Formyl-5-<Emphasis Type="Italic">tert</Emphasis>-Butylsalicylidenimino)propanol-2

The X-ray diffraction and magnetochemical studies of the acetate-bridged binuclear copper(II) complex with 1,3-bis(3-formyl-5-tert-butylsalicylidenimino)propanol-2 with a nearly planar structure of the exchange fragment are carried out (СIF file CCDC 940849). The assumption that the magnetic exchange in the complexes with the anticomplementary carboxylate exogenic bridges 1,3-O,O' is determined only by the structural factors and the bridging coordination of the solvent molecule changes the type of the exchange interaction between the copper(II) ions is proved to be true.     

1'-Phthalazinylhydrazone of acetylferrocene: Structure,properties, and complexing ability

1'-Phthalazinylhydrazone of acetylferrocene (HL) and copper(II) and nickel(II) complexes on its basis [CuL₂] and [NiL₂] have been synthesized and investigated. The structure of the hydrazine was determined by X-ray diffraction analysis. Quantum-chemical simulation of the tautomerism of the hydrazone was performed.     

Biacetyl monooxime ferrocenoylhydrazone and its complexing properties

Biacetyl monooxime ferrocenoylhydrazone has been synthesized and studied by ¹H NMR, IR, and electronic spectroscopy. The electronic absorption spectrum of the title compound in the UV and visible regions has been found to depend on the solvent polarity and pH. Most favorable structures of the hydrazone in solution and gas phase have been determined by quantum chemical calculations. The complexing ability of biacetyl monooxime ferrocenoylhydrazone toward copper(II), nickel(II), and zinc(II) ions has been estimated.