A Mononuclear Iron(II) Spin-Crossover Molecule Decorated by Photochromic Azobenzene Group
Aiming at constructing photoresponsive spin crossover (SCO) behavior, herein we designed a new ligand Abtz (Abtz = (<i>E</i>)-<i>N</i>-(4-((<i>E</i>)-phenyldiazenyl)phenyl)-1-(thiazol-4-yl)methanimine) which was decorated by a photochromic azobenzene group. Based...
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MDPI AG
2022-02-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/27/5/1571 |
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| author | Jiang-Zhen Qiu Yong You Ye Yu Zhuo-Fan Chen Cheng-Jie Guo Yi-Ling Zhong Wei-Quan Lin Xu-Gang Shu |
| author_facet | Jiang-Zhen Qiu Yong You Ye Yu Zhuo-Fan Chen Cheng-Jie Guo Yi-Ling Zhong Wei-Quan Lin Xu-Gang Shu |
| author_sort | Jiang-Zhen Qiu |
| collection | DOAJ |
| description | Aiming at constructing photoresponsive spin crossover (SCO) behavior, herein we designed a new ligand Abtz (Abtz = (<i>E</i>)-<i>N</i>-(4-((<i>E</i>)-phenyldiazenyl)phenyl)-1-(thiazol-4-yl)methanimine) which was decorated by a photochromic azobenzene group. Based on this photochromic ligand, a mononuclear Fe(II) SCO molecule [Fe(Abtz)<sub>3</sub>](BF<sub>4</sub>)<sub>2</sub>·(EAC)<sub>2</sub> (<b>1</b>, EAC = ethyl acetate) was successfully synthesized and showed a complete one-step SCO behavior. Under continuous UV light and blue-light exposure, the <i>cis–trans</i> photoisomerization of both ligand Abtz and compound <b>1</b> in the liquid phase was confirmed through UV–Vis spectra. Moreover, the <sup>1</sup>H-NMR spectra of Abtz reveal a <i>trans–cis</i> conversion ratio of 37%. Although the UV–Vis spectra reveal the photochromic behavior for <b>1</b> in the solution phase, the SCO behavior in the liquid state is absent according to the variable-temperature Evans method, suggesting the possible decomposition. Moreover, in the solid state, the <i>cis–trans</i> photoisomerization of both Abtz and <b>1</b> was not observed, due to the steric hindrance. |
| first_indexed | 2024-03-09T20:30:13Z |
| format | Article |
| id | doaj.art-840588b0502d46a4b11d14d58c89ed1c |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T20:30:13Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-840588b0502d46a4b11d14d58c89ed1c2023-11-23T23:26:28ZengMDPI AGMolecules1420-30492022-02-01275157110.3390/molecules27051571A Mononuclear Iron(II) Spin-Crossover Molecule Decorated by Photochromic Azobenzene GroupJiang-Zhen Qiu0Yong You1Ye Yu2Zhuo-Fan Chen3Cheng-Jie Guo4Yi-Ling Zhong5Wei-Quan Lin6Xu-Gang Shu7College of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, ChinaCollege of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, ChinaCollege of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, ChinaCollege of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, ChinaCollege of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, ChinaGuangzhou Key Laboratory for Clean Energy and Materials, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, ChinaGuangzhou Key Laboratory for Clean Energy and Materials, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, ChinaCollege of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, ChinaAiming at constructing photoresponsive spin crossover (SCO) behavior, herein we designed a new ligand Abtz (Abtz = (<i>E</i>)-<i>N</i>-(4-((<i>E</i>)-phenyldiazenyl)phenyl)-1-(thiazol-4-yl)methanimine) which was decorated by a photochromic azobenzene group. Based on this photochromic ligand, a mononuclear Fe(II) SCO molecule [Fe(Abtz)<sub>3</sub>](BF<sub>4</sub>)<sub>2</sub>·(EAC)<sub>2</sub> (<b>1</b>, EAC = ethyl acetate) was successfully synthesized and showed a complete one-step SCO behavior. Under continuous UV light and blue-light exposure, the <i>cis–trans</i> photoisomerization of both ligand Abtz and compound <b>1</b> in the liquid phase was confirmed through UV–Vis spectra. Moreover, the <sup>1</sup>H-NMR spectra of Abtz reveal a <i>trans–cis</i> conversion ratio of 37%. Although the UV–Vis spectra reveal the photochromic behavior for <b>1</b> in the solution phase, the SCO behavior in the liquid state is absent according to the variable-temperature Evans method, suggesting the possible decomposition. Moreover, in the solid state, the <i>cis–trans</i> photoisomerization of both Abtz and <b>1</b> was not observed, due to the steric hindrance.https://www.mdpi.com/1420-3049/27/5/1571spin crossover (SCO)azobenzene<i>cis–trans</i> photoisomerization |
| spellingShingle | Jiang-Zhen Qiu Yong You Ye Yu Zhuo-Fan Chen Cheng-Jie Guo Yi-Ling Zhong Wei-Quan Lin Xu-Gang Shu A Mononuclear Iron(II) Spin-Crossover Molecule Decorated by Photochromic Azobenzene Group Molecules spin crossover (SCO) azobenzene <i>cis–trans</i> photoisomerization |
| title | A Mononuclear Iron(II) Spin-Crossover Molecule Decorated by Photochromic Azobenzene Group |
| title_full | A Mononuclear Iron(II) Spin-Crossover Molecule Decorated by Photochromic Azobenzene Group |
| title_fullStr | A Mononuclear Iron(II) Spin-Crossover Molecule Decorated by Photochromic Azobenzene Group |
| title_full_unstemmed | A Mononuclear Iron(II) Spin-Crossover Molecule Decorated by Photochromic Azobenzene Group |
| title_short | A Mononuclear Iron(II) Spin-Crossover Molecule Decorated by Photochromic Azobenzene Group |
| title_sort | mononuclear iron ii spin crossover molecule decorated by photochromic azobenzene group |
| topic | spin crossover (SCO) azobenzene <i>cis–trans</i> photoisomerization |
| url | https://www.mdpi.com/1420-3049/27/5/1571 |
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