10.1021/cg3017408.s002 Chong-Qing Wan Chong-Qing Wan Ai-Min Li Ai-Min Li Shaeel A. Al-Thabaiti Shaeel A. Al-Thabaiti Thomas C. W. Mak Thomas C. W. Mak Group 12 Metal Complexes of Semirigid 2,6-Pyridinediyl­bis(3-pyridinyl)­methanone: Role of Counteranions and Solvent in Product Formation American Chemical Society 2013 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 00:00:00 Dataset https://acs.figshare.com/articles/dataset/Group_12_Metal_Complexes_of_Semirigid_2_6_Pyridinediyl_bis_3_pyridinyl_methanone_Role_of_Counteranions_and_Solvent_in_Product_Formation/2419672 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.