Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 20, Pages 5177-5185Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201900204
Keywords
coordination chemistry; isomerization; metal coordination; steric substituent; trans; cis conversion
Categories
Funding
- National Science Foundation for Distinguished Young Scholars of China [21525101]
- NSF of China [21571165]
- NSF of Hubei Province innovation group project [2017CFA006]
- NSF of Guangxi Province [2014GXNSFFA118003, 2017GXNSFDA198040]
- BAGUI talent and scholar program [2014A001]
- Project of Talents Highland of Guangxi Province
- CNRS-France
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For ethene derivatives with large groups the cis-isomer is often quite unstable and unavailable. Herein, we report an exception of two stable coordination complexes, (cis-L)ZnCl2, starting from trans-1,2-bis(1-R-benzo[d]imidazol-2-yl)ethene (R=H, L1; R=CH3, L2) ligands under solvothermal condition (T 140 degrees C). Using the intensity of the absorption and luminescence spectra as probes we proposed its progressive cis-to-trans reversal upon irradiation with UV light, which was confirmed by powder X-ray diffraction (PXRD). Similar results observed in the series of (cis-L2)(MCl2)-Cl-II [M=Fe (4), Co (5), Ni (6)] demonstrate the universal strategy. The results of PXRD, NMR spectroscopy, ESI-MS and DFT calculations support the above conclusion. NMR spectroscopy indicates that irradiation of 1 converts an optimized 71% of the cis-isomer to trans, whereas the free trans-L1 ligand transforms to only 15% cis-isomer under similar conditions.
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