New Heterometallic Hybrid
Polymers Constructed with Aromatic Sulfonate-Carboxylate Ligands:
Synthesis, Layered Structures, and Properties
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Abstract
Three novel alkali metal–cadmium coordination
polymers [K<sub>2</sub>Cd(Hsb)<sub>4</sub>(H<sub>2</sub>O)<sub>6</sub>]<sub>3<i>n</i></sub> <b>1</b>, [NaCd(sip)(DMF)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]<sub>2<i>n</i></sub> <b>2</b>, and [NaCd<sub>2</sub>(sip)<sub>2</sub>(DMF)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]<sub>2<i>n</i></sub>·2<i>n</i>Hdeta·2<i>n</i>H<sub>2</sub>O <b>3</b> (H<sub>2</sub>sb = 4-sulfobenzoic acid, H<sub>3</sub>sip = 5-sulfoisophthalic acid) have been synthesized and characterized
by single crystal X-ray diffraction and spectroscopic and thermogravimetric
methods. The solid state structure of <b>1</b> consists of inorganic
layers, formed from Na<sub>2</sub>O<sub>10</sub> and CdO<sub>6</sub>, polyhedral units, bridged via the sulfonate site of the ligand.
The layers are pillared by the organic portions of the ligands to
form a three-dimensional framework classified as I<sup>2</sup>O<sup>1</sup>. Compounds <b>2</b> and <b>3</b> display inorganic–organic
hybrid layers arranged in 3D via nonspecific (hydrophobic) interactions
between the DMF ligands. The two-dimensional frameworks of the layers
are classified as I<sup>1</sup>O<sup>1</sup> (in <b>2</b>) and
I<sup>0</sup>O<sup>2</sup> (in <b>3</b>). The guest diethylammonium
ions in <b>3</b> are arranged in hydrophobic channels along
the [011] crystallographic direction and circumvented by the DMF ligands
