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Sunlight-Induced In Situ Isomerization of Both Ligands in a Mixed-Ligand Coordination Polymer: From Photosalient to Photoinert Crystals |
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| Authors: | Dr. Basudeb Dutta Sambhunath Bera Prof. Chittaranjan Sinha Dr. Mohammad Hedayetullah Mir |
| Affiliation: | 1. Department of Chemistry, Aliah University New Town, Kolkata, 700 156 India Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal, 741 246 India These authors have contributed equally.;2. Department of Chemistry, Jadavpur University Jadavpur, Kolkata, 700 032 India;3. Department of Chemistry, Aliah University New Town, Kolkata, 700 156 India |
| Abstract: | Reaction of Zn(NO3)2 ⋅ 6H2O, maleic acid (H2mal) and trans-4-(1-naphthylvinyl)pyridine (trans-nvp) in the dark results in the formation of a one-dimensional coordination polymer (1D CP) [Zn(mal)(trans-nvp)] ( 1 ), which is photosalient in nature. The crystals of 1 pop violently under UV light and moderately in sunlight, and generate cyclobutane ligands. However, the same reaction mixture kept in visible light exhibits the rare example of in situ isomerization of both ligands: cis-trans transformation of maleate and trans-cis isomerization of the nvp ligands, and subsequent formation of another 1D CP [Zn(fum)(cis-nvp)2(H2O)2] ( 2 , H2fum=fumaric acid), which is found to be photoinert. Thus, altering the reaction condition from dark to visible light gives rise to photosalient to photoinert crystals. |
| Keywords: | coordination polymers [2+2] cycloaddition cyclobutane isomerization photosalient effect |