Effects of the atomic number of alkali atom and pore size of graphyne on the second‐order nonlinear optical response of superalkali salts of graphynes OM 3 + @ GYs − (M = Li, Na, and K)

• Published in: International journal of quantum chemistry 2021-02, Vol.121 (4)
• Main Authors: Hou, Na, Du, Fang‐Yue, Feng, Ran, Wu, Hai‐Shun, Li, Zhi‐Ru
• Format: Article
• Language: English
• ISSN: 0020-7608; 1097-461X
• DOI: 10.1002/qua.26477

Based on the combination of novel carbon material graphynes (GYs) and superalkalis (OM 3 ), a class of GY superalkali complexes, OM 3 + @(GY/GDY/GTY) − (M = Li, Na, and K), has been designed and investigated using the density functional theory method. Computational results reveal that these complexes with high stability can be regarded as novel superalkali salts of GYs due to electron transfer from OM 3 to GYs. For second‐order nonlinear optical response, these superalkali salts exhibit large first hyperpolarizabilities ( β 0 ). Two essential effects on β 0 values are found, namely, the atomic number of alkali atom in superalkali and the pore size of GY. Integrating the two effects, the selected combination of OLi 3 with large pore size graphtrigne (GTY) can lead to a considerable β 0 value (6.5 × 10 5 au), which is a new record for superatom‐doped GYs. In the resulting complex, the OLi 3 unit is located at the center of the pore of GTY, forming a planar structure with the highest stability among these salts. Besides large β 0 values, these superalkali salts of GYs have a deep‐ultraviolet working region; hence, they can be considered a kind of high‐performance deep‐ultraviolet NLO molecule.