Enhanced Second Harmonic Generation Response via Rational Design of Iodinated π-Conjugated Pyridine Group
Crystal materials constructed by π-conjugated units possess unique advantages due to their significant polarization anisotropy and hyperpolarizability, thereby attracting increasing attention in the field of nonlinear optical (NLO) crystals. Herein, two NLO compounds, i.e., 2,4-dihydroxypyridine (<b>I</b>) and 3-iodo-2,4-dihydroxypyridine (<b>II</b>), were successfully crystallized using the solution method, and both of the crystals belong to the non-centrosymmetric (NCS) space group <i>P</i>2<sub>1</sub>2<sub>1</sub>2<sub>1</sub>. <b>I</b> exhibits a moderate second harmonic generation (SHG) response (1.1 × KDP) with large birefringence (0.256@1064 nm), while new iodinated <b>II</b> exhibits enhanced SHG response (1.7 × KDP) by a more favorable arrangement. Besides, theoretical calculations have been performed to understand the origin of their optical properties.
Authors
- Zhanggui Hu (ORCID: https://orcid.org/0009-0004-0704-6105)
- Pifu Gong (ORCID: https://orcid.org/0000-0002-4656-1554)
- Zheshuai Lin (ORCID: https://orcid.org/0000-0002-9829-9893)
- Xinyuan Zhang (ORCID: https://orcid.org/0000-0003-0388-2240)
- Ning Ye (ORCID: https://orcid.org/0000-0002-3679-4047)
- Deshuai Xiao
Institutions
- Tianjin University of Technology (CN)
- Chinese Academy of Sciences (CN)
- Crystal Research (United States) (US)
- Technical Institute of Physics and Chemistry (CN)
- State Key Laboratory of Crystal Materials
Publication Details
- Journal
- Inorganic Chemistry
- Published
- 2025-10-29
- DOI
- https://doi.org/10.1021/acs.inorgchem.5c04571
- Citations
- 1
- Primary Topic
- Nonlinear Optical Materials Research
- Type
- article
- Field-Weighted Citation Impact
- 0.43