A bi-nuclear Cu(II)-complex for selective epoxidation of alkenes: Crystal structure, thermal, photoluminescence and cyclic voltammetry

Binuclear copper complex as a new dual‐use catalyst for cycloaddition and coupling reactions: Synthesis, characterization, and application

“…The ν asym (C=O) vibration can be assigned to the peak observed at 1626 cm −1 , whereas the bending vibration of H–N–H is attributed to the band at 1593 cm −1 . The 621‐cm −1 band is indicative of the stretching vibration of Cu–O bond 54–56 . When comparing the spectra of fresh and reused 1 , no substantial changes were observed, suggesting that catalyst 1 exhibits excellent stability even after multiple cycles of reuse.…”

“…The 621-cm À1 band is indicative of the stretching vibration of Cu-O bond. [54][55][56] When comparing the spectra of fresh and reused 1, no substantial changes were observed, suggesting that catalyst 1 exhibits excellent stability even after multiple cycles of reuse.…”

A Water‐Rich Cobalt(II) Compound: Hydrothermal Synthesis, Spectroscopic, Thermal, Crystal Structure Characterization and Antimicrobial Properties

“…The emission bands for H 2 ppda appear at 407 and 430 nm were attributed to the intra‐ligand π*→n or π*→π energy transitions (Figure S3) [44–46] . On other hand, phen which is known to be a weakly emissive compound, exhibits an emission peak at 425 nm with a shoulder centered at 481 nm arising from the closely lying π → π * transitions of aromatic π ‐rings [47–49] . A weak emissive signal observed at 533 nm is assigned to the extended π‐conjugation in the ligand system (phen) [50] .…”

“…[44][45][46] On other hand, phen which is known to be a weakly emissive compound, exhibits an emission peak at 425 nm with a shoulder centered at 481 nm arising from the closely lying π!π* transitions of aromatic π-rings. [47][48][49] A weak emissive signal observed at 533 nm is assigned to the extended π-conjugation in the ligand system (phen). [50] The photoexcitation of 1 at 300 nm produces a luminescence spectrum showing resemblance to the phen spectrum with an emission maximum at 424 nm, a shoulder peak centering at 485 nm and a weak peak at 537 nm corresponding to ligand-centered (LC) fluorescence.…”

An Oxalate-Bridged Copper(II) Complex Combining Monodentate Benzoate, 2,2′-bipyridine and Aqua Ligands: Synthesis, Crystal Structure and Investigation of Magnetic Properties

“…A detailed search carried out in the Cambridge Structural Database (CSD) [31] for oxalate-bridged copper(II) complexes with ox 2in bis-bidentate coordination mode displayed a total of 423 results, of which 86 correspond to dinuclear complexes that possess two additional ligands besides ox 2-. Out of 86 structures, 66 contain pentacoordinate metal ions bound to only one type of organic ligand such as pyridine [1], 2,2 -bipyridine [11,32], phenanthroline [33,34], ethylenediamine [35], pyrazole [36,37] and imidazole [38] and their derivatives, the coordination sphere being completed by simple inorganic ions such as nitrate [39], chloride [33], hydroxide [40] and perchlorate [1], or by solvent molecules such as water [6], methanol [34], dimethylformamide [41], tetrahydrofuran [42] or acetonitrile [43]. In the 20 remaining structures, all of which have been reported more recently, the metal ions are hexacoordinate and the chemical composition of the complexes, regarding the presence of at least one organic ligand, solvent molecules and simple inorganic ions, is similar to that observed for the pentacoordinate species [8,11,14,15,44,45].…”