A new isophorone-based ligand and its Ag(I) complex: crystal structures and luminescence

Abstract

An isophorone-based ligand with a delocalized π-electron system, 2-{5,5-dimethyl-3-[2-(pyridine-4-yl)ethenyl]cyclohex-2-enylidene}propanedinitrile (L), was synthesized. By assembling the ligand with AgNO₃, a mononuclear complex [Ag(L)₂]NO₃·H₂O was obtained. Compared with the free ligand, the complex shows superior luminescent properties with large red-shift and longer fluorescence lifetime.

The ligand in the Ag(I) complex shows more planar structure than the free ligand. Therefore, red shift emission and longer lifetime were realized by coordination of Ag(I) to the ligand.

Keywords:

• Self-assembly
• Ag(I) complex
• Crystal structure
• Luminescent property

Funding

This work was supported by Program for New Century Excellent Talents in University (China); Doctoral Program Foundation of Ministry of Education of China [grant number 20113401], [grant number 110004]; National Natural Science Foundation of China [grant number 21271003], [grant number 21271004]; the 211 Project of Anhui University, the Anhui University Students Research Training Program [grant number kyxl2012020]; the Graduate Students Innovative Program of Anhui University [grant number 10117700063]; and Natural Science Foundation of Education Committee of Anhui Province [grant number KJ2012A024], [grant number KJ2013B201].