pH- and mol-ratio dependent formation of zinc(II) coordination polymers with iminodiacetic acid: Synthesis, spectroscopic, crystal structure and thermal studies

✍ Scribed by Lu-Bin Ni; Rong-Hua Zhang; Qiong-Xin Liu; Wen-Sheng Xia; Hongxin Wang; Zhao-Hui Zhou

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 718 KB
• Volume: 182
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2009.06.042

✦ Synopsis

Three novel zinc coordination polymers (NH(4))(n)Zn(Hida)Cl(2) (1), Zn(ida)(H(2)O)(2) (2), Zn(Hida)(2)·4nH(2)O (3) (H(2)ida = iminodiacetic acid) and a monomeric complex [Zn(ida)(phen)(H(2)O)]·2H(2)O (4) (phen=1,10-phenanthroline) have been synthesized and characterized by X-ray diffraction methods. 1 and 2 form one-dimensional (1-D) chain structures, whereas 3 exhibits a three-dimensional (3-D) diamondoid framework with an open channel. The mononuclear complex 4 is extended into a 3-D supramolecular architecture through hydrogen bonds and π-π stacking. Interestingly, cyclic nonplanar tetrameric water clusters are observed that encapsulated in the 3-D lattice of 4. Based on (1)H and (13)C NMR observations, there is obvious coordination of complex 2 in solution, while 1 and 3 decompose into free iminodiacetate ligand. Monomer [Zn(ida)(H(2)O)(3)] (5) is considered as a possible discrete species from 2. These coordination polymers can serve as good molecular precursors for zinc oxide.