Each dimeric Cd II building block i

Each dimeric Cd II building block is connected with fourneighboring dimeric units (Figure 4b) via the coordination offour terminal carboxylate groups from four L ligands. As aresult, each Cd2 metal center is thus linked by two 4-connected (Cd1) 2 cores, and each binuclear assembly is linkedto four Cd2 ions to yield a 2D network (Figure S14). Notably,the C26−H26A···π- and π···π-stacking interactions betweenthe quinoline rings of adjacent binuclear units are critical forthe formation of a 2D layer network (Figure S15). The layeredstructure extends into a 3D open framework featuring a 1Dchannel along the b axis (with the largest dimension of 11.7 ×4.2 Å 2 ) via other noncovalent interactions (Figure 4c).PLATON calculations illustrate that 27.2% void spaceaccessible to solvent molecules (2248.4 Å 3 per unit cell) iscontained in complex 3.