Wan, Chong-Qing Li, Ai-Min Al-Thabaiti, Shaeel A. C. W. Mak, Thomas Group 12 Metal Complexes of Semirigid 2,6-Pyridinediyl­bis(3-pyridinyl)­methanone: Role of Counteranions and Solvent in Product Formation In a series of nine group 12 metal complexes of 2,6-pyridine­diyl­bis­(3-pyridinyl)­methanone (abbreviated as L), namely, [Cd­(L)<sub>2</sub>­Cl<sub>2</sub>] (<b>1</b>), [Cd­(L)<sub>2</sub>­(NO<sub>3</sub>)<sub>2</sub>]·3.5H<sub>2</sub>O (<b>2</b>), [Cd­(L)<sub>2</sub>­(H<sub>2</sub>O)<sub>2</sub>]­(NO<sub>3</sub>)<sub>2</sub> (<b>3</b>), [Cd­(L)<sub>2</sub>­(H<sub>2</sub>O)<sub>2</sub>]­(ClO<sub>4</sub>)<sub>2</sub>·H<sub>2</sub>O (<b>4</b>), {[Cd­(L)­(H<sub>2</sub>O)<sub>2</sub>]­(ClO<sub>4</sub>)<sub>2</sub>·1.5H<sub>2</sub>O}<sub>∞</sub> (<b>5</b>), {[Cd­(L)<sub>2</sub>­SO<sub>4­</sub>(H<sub>2</sub>O)]·2.8H<sub>2</sub>O}<sub>∞</sub> (<b>6</b>), [Cd­(L)<sub>2­</sub>(CH<sub>3</sub>­CO<sub>2</sub>)<sub>2</sub>]<sub>∞</sub> (<b>7</b>), [Zn­(L)<sub>2</sub>­(CH<sub>3</sub>­CO<sub>2</sub>)<sub>2</sub>]<sub>∞</sub> (<b>8</b>), and [Hg­(L)<sub>2</sub>­(CH<sub>3</sub>­CO<sub>2</sub>)<sub>2</sub>]<sub>∞</sub> (<b>9</b>), the semirigid multidentate ligand L exhibits flexible ligation modes I–IV in response to the cooperative effect of counteranions and solvent medium, leading to mononuclear (<b>1</b>–<b>4</b>), helical-chain (<b>6</b>), zigzag-chain (<b>7</b>), and 3D net (<b>5</b>) coordination motifs. The presence of the ancillary aqua ligand is essential for the crystallization of <b>3</b> and <b>5</b> by addition of deionized water to an organic mixed-solvent medium containing <b>2</b> and <b>4</b>, respectively. The acetate complexes <b>7</b> (Cd<sup>2+</sup>), <b>8</b> (Zn<sup>2+</sup>), and <b>9</b> (Hg<sup>2+</sup>) are isostructural. Unconventional anion−π­(pyridine), CO···CO, O­(NO<sub>3</sub><sup>–</sup>/ClO<sub>4</sub><sup>–</sup>)···CO, and cohesive nitrate···nitrate interactions are manifested in supramolcular aggregations of the present series of crystalline complexes. aqua ligand;ligation modes;supramolcular aggregations;Product FormationIn;group 12 metal complexes;semirigid multidentate ligand L exhibits;acetate complexes 7;3 D;group 12 Metal Complexes;deionized water 2013-05-01
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10.1021/cg3017408.s002