Paddlewheel-Type Dirhodium Tetrapivalate Based Coordination Polymer: Synthesis, Characterization, and Self-Assembly and Disassembly Transformation Properties

An extended one-dimensional chain-type coordination polymer, [Rh2(piv)4(tpy)]n (1; piv = pivalate, tpy = 2,2′:6′,2″-terpyridine), has been synthesized and characterized by single-crystal and powder X-ray diffraction analyses, elemental analysis, IR spectrosopy, thermogravimetric analysis, UV/Vis diffuse reflectance spectroscopy, and magnetic measurements at 300 K. This complex shows unique repeatable self-assembly and disassembly transformation properties. Polymer 1 readily decomposed to its constituent building blocks, that is, [Rh2(piv)4] and tpy, in organic solvents at 300 K, but the disassembly product of 1 readily re-self-assembled to give 1 as a crystalline product in aqueous ethanol solution at 373 K. In addition, 1 was obtained as a crystalline powder by a water-assisted mechanochemical synthesis route.

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