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The reaction of the bifunctional ligand (1,8-naphthalimido)propanoate (LC2−), containing a carboxylate group for metal bonding and a 1,8-naphthalimide group for π···π stacking interactions, with Zn(O2CCH3)2(H2O)2 yields a novel heptanuclear complex [Zn7(O)2(LC2)10(DMF)2]. In the solid-state structure, a central zinc(II) cation is linked to six terminal zinc(II) cations by ten bridging carboxylate ligands and two μ4-O ions forming a vertex shared bitetrahedron, a new type of secondary building unit (SBU). The heptanuclear units are organized into a complex three-dimensional architecture by π···π stacking interactions of the 1,8-naphthalimide groups. Eight of the naphthalimide rings on each heptanuclear unit form π···π stacking interactions with rings on eight adjacent units generating a unique “single linked” three-dimensional architecture. The TGA data indicate this structure is robust and luminescent studies show the solid emits in the green region. |
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