Effect of Organic Polycarboxylate
Ligands on the Structures
of a Series of Zinc(II) Coordination Polymers Based on a Conformational
Bis-triazole Ligand
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Abstract
To explore the influence of six structurally different
polycarboxylate
ligands H<sub>2</sub>L<sup>1</sup> to H<sub>4</sub>L<sup>6</sup> in
the system Zn(II)/btmx, six coordination polymers, formulated as [Zn(btmx)(L<sup>1</sup>)]<sub><i>n</i></sub> (<b>1</b>), {[Zn(btmx)(L<sup>2</sup>)]·2H<sub>2</sub>O}<sub><i>n</i></sub> (<b>2</b>), {[Zn(btmx)(L<sup>3</sup>)]·1.5H<sub>2</sub>O}<sub><i>n</i></sub> (<b>3</b>), [Zn(btmx)(L<sup>4</sup>)]<sub><i>n</i></sub> (<b>4</b>), {[Zn<sub>4</sub>(btmx)<sub>3</sub>(L<sup>5</sup>)<sub>4</sub>(H<sub>2</sub>O)<sub>2</sub>]·4H<sub>2</sub>O}<sub><i>n</i></sub> (<b>5</b>), and [Zn(btmx)(H<sub>2</sub>L<sup>6</sup>)]<sub><i>n</i></sub> (<b>6</b>), have been obtained under similar
conditions (btmx = 1,4-bis(1,2,4-triazol-1-ylmethyl)-2,3,5,6-tetramethylbenzene,
H<sub>2</sub>L<sup>1</sup> = 1,3-benzenedicarboxylic acid, H<sub>2</sub>L<sup>2</sup> = 1,4-benzenedicarboxylic acid, H<sub>2</sub>L<sup>3</sup> = 1,3-adamantanedicarboxylic acid, H<sub>2</sub>L<sup>4</sup> <b>=</b> 1,3-adamantanediacetic acid, H<sub>2</sub>L<sup>5</sup> = 4,4′-oxidibenzoic acid, and H<sub>4</sub>L<sup>6</sup> =
3,3′,4,4′-benzophenone tetracarboxylic acid). The structure
determination reveals that complexes <b>1</b> and <b>4</b> are two-dimensional (2D) layered networks and exhibit typical (4,4)
topological nets. Complex <b>2</b> shows an undulating 2D (4,4)-network
with 2-fold interpenetration. Complex <b>3</b> possesses a three-dimensional
(3D) 3-fold interpenetrating 4-connected framework of 6<sup>6</sup>-<b>dia</b> topology. Both <b>5</b> and <b>6</b> have different 3D interpenetrated motifs generated by 2D →
3D interpenetration. Complex <b>5</b> belongs to a 3D framework
built from the interpenetration of 2D bilayers in an inclined mode,
while <b>6</b> involves a parallel interpenetration between
the adjacent 2D (4,4) layers. This work markedly indicates that the
effect of polycarboxylate ligands is significant in the construction
of these networks
