Syntheses, Characterizations,
and Properties of Five
Interpenetrating Complexes Based on 1,4-Benzenedicarboxylic Acid and
a Series of Benzimidazole-Based Linkers
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Abstract
Five interesting interpenetrating networks, namely, [Co(<i>p</i>-bdc)(beb)<sub>0.5</sub>]<sub><i>n</i></sub> (<b>1</b>), {[Co(<i>p</i>-bdc)(bmb)]·H<sub>2</sub>O}<sub><i>n</i></sub> (<b>2</b>), {[Co(<i>p</i>-bdc)(bmp)]·H<sub>2</sub>O}<sub><i>n</i></sub> (<b>3</b>), {[Zn(<i>p</i>-bdc)(bmp)]·H<sub>2</sub>O}<sub><i>n</i></sub> (<b>4</b>), and [Zn<sub>2</sub>(<i>p</i>-bdc)<sub>2</sub>(bmp)(H<sub>2</sub>O)<sub>2</sub>]<sub><i>n</i></sub> (<b>5</b>) [<i>p</i>-H<sub>2</sub>bdc = 1,4-benzenedicarboxylic acid, beb = 1,4-bis(2-ethylbenzimidazol-1-ylmethyl)benzene,
bmb = 1,4-bis(2-methylbenzimidazol-1-ylmethyl)benzene, and bmp = 1,5-bis(2-methylbenzimidazol)
pentane], have been synthesized by employing mixed ligands of various
benzimidazole-based ligands with <i>p</i>-H<sub>2</sub>bdc.
Complex <b>1</b> possesses a 2-fold interpenetrating 3D framework
with (4<sup>12</sup>·6<sup>3</sup>)-pcu topology. Complex <b>2</b> exhibits a 3-fold interpenetrating 3D network with 6<sup>6</sup>-dia topology, and complex <b>3</b> displays a 4-fold
interpenetrating 3D diamond network containing Co/bmp left- and right-handed
helical chains. Obviously, with the reducing of the steric hindrance
of the N-donor ligand, complexes <b>1</b>–<b>3</b> show interpenetrating networks from 2-fold to 3-fold and 4-fold.
Complex <b>4</b> is isostructural to <b>3</b> and also
forms a 4-connected 3D framework with a diamond topology. Complex <b>5</b> features a 3D framework generated by 2D → 3D interpenetration
and exhibits (8<sup>2</sup>·10)<sub>2</sub> topology. Our study
shows that the steric hindrance changing of ligands can tune the final
interpenetrating networks directly
