The tacticity control of the organic polymers is one of the important issues both in academic and industrial areas. We obtained the isotactic organic polymer inside a 3D Zn(II) MOF 1 based on a mixture of bpeb and H2bdc through the photo-induced [2+2] cycloaddition reaction as a first case.1 While a bent H2obc ligand was used instead of the linear H2bdc ligand, we obtained the syndiotactic organic polymer inside a 3D Zn(II) MOF 2.2 In the 6-fold interpenetrated MOF 1, the bpeb ligands show a herringbone-type slip-stacked pattern which results in the formation of the isotactic organic polymer in metal-oragano-polymeric framework (MOPF 1, see below). Since the MOF 2 was photo-inactive, upon heating the bpeb ligand with trans,trans,trans-conformation undergoes pedal motion to trans,cis,trans-conformation and yield the MOPF 2 containing 2D network fused with the syndiotactic organic polymer. We also found that the both prepared organic polymers with different tacticities in the single crystal form are depolymerized reversibly by cleaving the cyclobutane rings upon heating. References 1. I.-H. Park, A. Chanthapally, Z. Zhang, S. S. Lee, M. J. Zaworotko, J. J. Vittal, Angew. Chem. Int. Ed. 2014, 53, 414. 2. I.-H. Park, R. Medishetty, H.-H. Lee, C. E. Mulijanto, H. S. Quah S. S. Lee, J. J. Vittal, Angew. Chem. Int. Ed. 2015, 54, 7313.

Tacticity control of organic polymers inside MOFs via [2+2] photo-polymerization reactions

251st National Meeting (2016)

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