[Study on the Structure and Photoluminescent Properties of Mono-Zn(â
¡) and Di-Cu(â
) Complexes Constructed from Nitrogen Heterocyclic Ring Ligand].
Guang Pu Xue Yu Guang Pu Fen Xi
; 36(4): 996-1000, 2016 Apr.
Article
in Zh
| MEDLINE
| ID: mdl-30048096
ABSTRACT
The mononuclear Zn(â
¡) complex [Zn(2,6-PDA)(phen)H2O]·H2O (1) and binuclear Cu(â
) complex{[Cu(µ-â
)(phen)H2O]·H2O}2 (2) (2,6-H2PDA=2,6- pyridinedicarboxylic acidï¼phen=1,10- phenanthroline monohydrate) have been prepared with hydro-thermal synthesis method. These complexes have been characterized with single-crystal X-ray, elemental analysis, and IR spectroscopy. The fluorescence spectra of 1 and 2 are studied in solid-state and dimethyl sulfoxide (DMSO) solution. The maximum absorption peak of 1 and 2 are at 253 nm and 242 nm respectively, which are red shift to that of the phen ligand with inceased intensity. It may be assigned to the intraligand πâπ* transition of the phen ligand that is modified by the Zn(â
¡) or Cu(â
) ions. On the basis of the coordination, the absorption of organic ligands in the ultraviolet region is increased, which is better for the energy absorption of the ligand. 1 and 2 all showed blue light emission. The emission peak of 1 and 2 have experienced a red shift (ca. 55 and 23 nm) in the solid state (λem = 407, 434, 467 nm for 1, 442, 469, 501 nm for 2) compared to in DMSO solution (λem = 361, 379, 392 nm for 1, 422, 443, 461 nm for 2). The red shift phenomenon can be attributed to the π-stacking of the aromatic rings and other intermolecular Interactions in these molecules in the solid state. Especially, the strong Cu(â
)
Cu(â
) interaction of 2 can decrease the HOMOLUMO energy gap with the red-shifted emission wavelength.
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Collection:
01-internacional
Database:
MEDLINE
Language:
Zh
Journal:
Guang Pu Xue Yu Guang Pu Fen Xi
Year:
2016
Type:
Article