Unconventional Heterobidentate Coordination of 4-Hydroxypyridine Leading to Remarkably Strong Second-Harmonic
Can Yang1, Jie Gou1, Yaolong Zhu1
1State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan, 430200, People's Republic of China.
Abstract:
Herein, we report an unconventional heterobidentate coordination mode of conventional 4-hydroxypyridine ligand in a novel compound Zn(C5H4NO)2. The strong heterobidentate coordination interactions between Zn2+ and 4-hydroxypyridine ligands promote a uniform alignment of the polarization of each [ZnO2N2] tetrahedral building unit, resulting in remarkably strong second-harmonic generation (SHG) with an intensity that is the largest among all UV-transparent Zn-containing metal-organic compounds reaching 13.6×KDP. Moreover, Zn(C5H4NO)2 processes a suitable optical band gap of 4.40 eV, high thermal stability up to 300 °C, excellent air stability, and strong water resistance, demonstrating great application potential. Additionally, Zn(C5H4NO)2 exhibits photoluminescence with a significantly enhanced lifetime of 558 ms, accompanied by a rare blue afterglow visible to the naked eye, lasting up to 5 s.
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