Akademik Veri Yönetim Sistemi
Crystal Growth and Design, 2025 (SCI-Expanded)
In this study, a new 2D anionic cadmium(II) coordination polymer with isophthalic acid (H2ipa) and 1,1′-dimethyl-(4,4′-bipyridine)-1,1′-diium bromide (Me2bipy) formulated as (Me2bipy)[Cd3(μ3-ipa)2(μ4-ipa)2]n (1) was synthesized and characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction techniques. The thermal property and phase purity of 1 were investigated by thermal analyses (TG, DTA, and DTG) and powder X-ray diffraction (PXRD) techniques. In 1, the ipa ligand coordinates three- and tetradentate coordination modes. The structure of 1 features a 2D network with a {44.62} point symbol and sql topology, which extends into a 3D supramolecular framework through π···π stacking and C-H···O hydrogen bonding interactions. Host-guest chemistry was employed to incorporate electron-poor viologen guests between the layers of the 2D anionic framework in 1. Although viologen-containing coordination polymers are often responsive to light, the viologen guests in 1 induce reversible ultrafast photochromism upon UV-vis irradiation. The photochromic behavior results from photoinduced electron transfer to the viologen guest, generating free radicals. These radicals can also be formed by heating compound 1. At 200 °C, 1 exhibits thermochromic behavior, showing the same color change as observed under UV-vis light. Additionally, compound 1 displays visually detectable, differentiable vapochromic responses to various volatile amines, likely due to electron transfer from the electron-rich amines to the electron-deficient viologen guest.