Synthesis, structures and spectroscopic properties of new 1,2-bis[2-(4-methyl-7-acetylamino-1,8-naphthyridine)]ethylene ligand and its binuclear copper(I) complexes

Add time:07/13/2019    Source:sciencedirect.com

The synthesis, characterization, spectroscopic properties of a new ligand 1,2-bis[2-(4-methyl-7-acetylamino-1,8-naphthyridine)]ethylene (L) and its two binuclear Cu(I) complexes containing triphenylphosphine (PPh3) or bis(diphenylphosphino)methane (dppm), [Cu2(L)(PPh3)4](BF4)2·2CH2Cl2 (1·2CH2Cl2) and [Cu2(L)(dppm)2](BF4)2·4H2O (2·4H2O) are reported. The structural investigation of these compounds based on X-ray crystal analysis shows that the copper(I) centers adopt different coordination geometries, O(N)CuP2+ and NCuP2+ for complexes 1 and 2, respectively. Upon irradiation of a degassed organic solution of L at 365 nm, photoinduced isomerization reaction and an intramolecular proton transfer of ligand L were detailed studied by absorption spectral changes. A spectroscopic investigation involving time-dependent density functional theory calculations allows assignment of the excited states that relate to emission and transient absorption spectra. The observed lower-energy absorption bands appearing in the region of 413 and 418 nm for 1 and 2 in dichloromethane are assigned to ligand-to-ligand charge transfer (LLCT, phosphine → napy) transition in nature. Compared with well-structured solid-state emission originating from ππ∗ transition of ligand L, complexes 1 and 2 exhibit intense room-temperature solid-state emissions with λmax at 586 and 620 nm, respectively. The energy and the shape of the emission bands are clearly different from that of the ligand, indicating the emissions come from different excited states.

We also recommend Trading Suppliers and Manufacturers of METHYL 2-(ACETYLAMINO)-5-NITROBENZOATE (cas 5409-45-0). Pls Click Website Link as below: cas 5409-45-0 suppliers

Prev:Steric influence of the 6-methyl group on the molecular and crystal structures of copper(II) chloride complexes with 2-(N-acetylamino)-6-methylpyridine
Next:Tautomeric stability, vibrational, electronic, NBO, and NMR analyses of N-[acetylamino-(3-nitrophenyl)methyl]-acetamide (ANPMA) by ab initio HF and DFT calculations)