4-Formylphenyl--D-allopyranoside decorated diorganotin(IV) crystalline solid with chevron architecture: An effective water-stable adsorbent against aqueous organic dyes

A glucosyl appended chromone-based diorganotin(IV) crystalline solid (DOC) is obtained from beta-D-allopyrano-side substituted 3-hydroxy-benzo-gamma-pyrone. The combination of organotin(IV) unit, glucosyl substituent and chromone skeleton introduced some special features to the solid including controlled solubility, water stability, and plenty of interactive sites. The step-wise formation of products is supported by FT-IR spectroscopy, multi nuclear NMR spectroscopy, CHN elemental analyses, mass spectrometry, scanning electron microscopy, thermal gravimetric analysis, and single-crystal X-ray diffraction analyses. The DOC molecules led to herringbone architecture via O-H center dot center dot center dot O, C-H center dot center dot center dot Sn, C-H center dot center dot center dot O, C-H center dot center dot center dot pi, and pi center dot center dot center dot pi interactions, where each DOC molecule possessed "skew-trapezoidal bipyramidal" geometry. Furthermore, the DOC has been found efficient adsorbent for organic dyes with a partition coefficient of 793.3 mg g(-1) mu M-1 for Brilliant blue. The theoretical studies justified the highest adsorption of Brilliant blue due to the small value of the HOMO-LUMO energy gap (Delta E = 0.34 eV), the high value of electrophilicity index (omega = 40.64), and the low value of chemical hardness (eta = 0.17 eV). The Langmuir model and pseudo-second-order model well-described the adsorption parameters like adsorption behaviour, diffusion, and removal rates of dyes. Based on the results, the DOC is expected as a viable option for the uptake of organic dyes from an aqueous solution.