| บทคัดย่อ |
Iodo–cadmium(II) complexes with a diversity of crystalline architectures have been prepared via a combination of a Cd(II) precursor and varied iodine solutions. The iodo–Cd(II) complexes with 1,10-phenantroline were assembled via a dissolution–recrystallization structural transformation (DRST) process at room temperature. The mixtures of the Cd(II) precursor, namely [Cd(AS)2(phen)2]EtOH (1) (where AS = 4-aminosalicylate, phen = 1,10-phenantroline, EtOH = ethanol), with a methanolic or ethanolic solution of I2 result in the construction of a new Cd(II) complex, namely [Cd(I)(I3)(phen)2] (2), whereas different known Cd(II) complexes, namely [Cd(I)2(phen)2] (3) and [Cd(I)2(phen)]n (4), were obtained from DRST of 1 in I2-containing tetrahydrofuran, and acetonitrile or acetone, respectively. Remarkably, the versatile 4-aminosalicylate ligand has been proven as a key ancillary to initiate the DRST process of 1 at room temperature through a coordinated substitution by iodide/polyiodide anions, which stabilizes a new supramolecular coordination framework via weak intermolecular hydrogen bonds. Moreover, taking advantage of the flexible nature of the supramolecular framework, complex 2 exhibits a thermally-induced structural transformation, and the reversible DRST process of 3 to the original 1 has been realized. |
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