[2 + 2] Photodimerization of Sulfonate Derivative of trans-Cinnamic Acid: Kinetics Study Using Solid State 13C NMR and Hybrid Material Inclusion
(2020) Crystal Growth & Design — Vol. 20, n° 12, p. 7850-7861 (2020)
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Kumar2020-PhotodimerizationofSulfonateDerivativeoftrans-CinnamicAcidKineticsStudyUsingSolidState13CNMRandHybri.pdf
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- A sulfonic acid, namely p-sulfocinnamic acid (psca), has been synthesized and characterized spectroscopically as well as by single crystal X-ray diffraction. The crystal structure of psca reveals that it fulfils Schmidt’s topochemical rules for [2 + 2] photodimerization and the molecules to be dimerized are arranged in head-to-tail manner, confirming psca to be an α-type polymorph. The [2 + 2] photodimerization of psca has been monitored using solid state 13C CP-MAS NMR spectroscopy which certifies a 100% photoconversion to yield to 4,4′-disulfonate-truxillic acid (dsta). The Avrami constant, n = 1.8(1), derived from the Johnson–Mehl–Avrami–Kolmogorov (JMAK) model, indicates that [2 + 2] photodimerization proceeds with a decreasing nucleation rate and formation of dsta occurs through a one-dimensional heterogeneous linear growth. The crystal structure of dsta unveils it to be a centrosymmetric molecule. The solvent molecules present in the crystal lattice interconnect all truxillic acid molecules through a 3D hydrogen bonding network. Guest insertion of psca into a selected inorganic host-network, as a proof of concept for hybrid materials design, provided [Fe(H2O)6](psca)2·2H2O, which has been structurally characterized and investigated by 57Fe Mössbauer spectroscopy.
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Kumar, V., Fusaro, L., Aprile, C., Robeyns, K., & Garcia, Y. (2020). [2 + 2] Photodimerization of Sulfonate Derivative of trans-Cinnamic Acid: Kinetics Study Using Solid State 13C NMR and Hybrid Material Inclusion. Crystal Growth & Design, 20(12), 7850-7861. https://doi.org/10.1021/acs.cgd.0c01149 (Original work published 2020)