Coordination Polymers Constructed from Semi-Rigid <i>N,N</i>′-Bis(3-pyridyl)terephthalamide and Dicarboxylic Acids: Effect of Ligand Isomerism, Flexibility, and Identity
oleh: Chia-Jou Chen, Chia-Ling Chen, Yu-Hsiang Liu, Wei-Te Lee, Ji-Hong Hu, Pradhumna Mahat Chhetri, Jhy-Der Chen
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2020-12-01 |
Deskripsi
Reactions of the semi-rigid <i>N</i>,<i>N</i>′-bis(3-pyridyl)terephthalamide (<b>L</b>) with divalent metal salts in the presence of dicarboxylic acids afforded [Cd(<b>L</b>)<sub>0.5</sub>(1,2-BDC)(H<sub>2</sub>O)]<sub>n</sub> (1,2-H<sub>2</sub>BDC = benzene-1,2-dicarboxylic acid), <b>1</b>, {[Cd(<b>L</b>)<sub>1.5</sub>(1,3-BDC)(H<sub>2</sub>O)]·5H<sub>2</sub>O}<sub>n</sub> (1,3-H<sub>2</sub>BDC = benzene-1,3-dicarboxylic acid), <b>2a</b>, {[Cd(1,3-BDC)(H<sub>2</sub>O)<sub>3</sub>]·2H<sub>2</sub>O}<sub>n</sub>, <b>2b</b>, {[Cd(<b>L</b>)<sub>0.5</sub>(1,4-BDC)(H<sub>2</sub>O)<sub>2</sub>]·H<sub>2</sub>O}<sub>n</sub> (1,4-H<sub>2</sub>BDC = benzene-1,4-dicarboxylic acid), <b>3</b>, and [Cu(<b>L</b>)<sub>0.5</sub>(5-tert-IPA)]<sub>n</sub> (5-tert-IPA = 5-tert-butylbenzene-1,3-dicarboxylic acid), <b>4</b>, which have been structurally characterized by single crystal X-ray diffraction. Complexes <b>1</b> and <b>3</b> are two-dimensional (2D) layers with the <b>bey</b> and the <b>hcb</b> topologies, and <b>2a</b> and <b>2b</b> are one-dimensional (1D) ladder and zigzag chain, respectively, while <b>4</b> shows a 3-fold interpenetrated three-dimensional (3D) net with the <b>cds</b> topology. The structures of these coordination polymers containing the semi-rigid <b>L</b> ligands are subject to the donor atom positions and the identity of the dicarboxylate ligands, which are in marked contrast to those obtained from the flexible bis-pyridyl-bis-amide ligands that form self-catenated nets. The luminescence of <b>1</b> and <b>3</b> and thermal properties of complexes <b>1</b>, <b>3,</b> and <b>4</b> are also discussed.