Structural Diversity for
a Series of Novel Zn Metal–Organic Frameworks Based on Different
Secondary Building Units
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Abstract
The secondary building unit (SBU) has been identified
as a useful tool in the synthesis of metal–organic frameworks
(MOFs). Herein, we synthesized six novel Zn complexes, namely, {[Zn<sub>3</sub>(tci)<sub>2</sub>(DMF)<sub>2</sub>)]·2DMF·2CH<sub>3</sub>OH}<sub><i>n</i></sub> (<b>1</b>), {[Zn<sub>3</sub>(tci)<sub>2</sub>(DMSO)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]·2DMSO·3H<sub>2</sub>O}<sub><i>n</i></sub> (<b>2</b>), {[ZnNa(tci)(H<sub>2</sub>O)]·2H<sub>2</sub>O}<sub><i>n</i></sub> (<b>3</b>), {[Zn<sub>5</sub>(tci)<sub>2</sub>(OH)<sub>4</sub>(H<sub>2</sub>O)<sub>2</sub>]·2H<sub>2</sub>O}<sub><i>n</i></sub> (<b>4</b>), {[Zn<sub>3</sub>(tci)<sub>2</sub>(phen)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]·4H<sub>2</sub>O}<sub><i>n</i></sub> (<b>5</b>), and {[Zn<sub>3</sub>(tci)<sub>2</sub>(btb)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]·6H<sub>2</sub>O}<sub><i>n</i></sub> (<b>6</b>) by utilizing different SBUs (tci = tris(2-carboxyethyl)
isocyanurate, phen = 1,10-phenanthroline, btb = 1,4-bis (1,2,4-triazole-1-ylmethyl)
benzene). Complexes <b>1</b>–<b>4</b> were synthesized
only by changing solvents, and complexes <b>5</b> and <b>6</b> were obtained by adding different auxiliary ligands on the
same conditions. Structural analyses show that complexes <b>1</b> and <b>2</b> possess two-dimensional (2D) structures based
on linear and triangular trinuclear Zn clusters. Complexes <b>3</b> and <b>4</b> exhibit 2D and three-dimensional (3D) frameworks
built on rare infinite rod-shaped SBUs, while complex <b>5</b> belongs to a 3D framework with two kinds of left- and right-helical
chains built from discrete dinuclear Zn clusters and mononuclear Zn
atoms. Complex <b>6</b> exhibits high-connected 3D framework
based on extended linear trinuclear Zn clusters
