A series of 1D, 2D and 3D coordination polymers based on a 5-(benzonic-4-ylmethoxy)isophthalic acid: syntheses, structures and photoluminescence

Seven new coordination polymers, namely, [Zn(HL)(H2O)] (1), [Zn(HL)(phen)]center dot 1.5H(2)O (2), [Zn(HL) (L-1)] (3), [Zn-2(HL)(2)(L-2)(2)]center dot 2H(2)O (4), [Zn(HL)(L-3)(0.5)] (5), [Zn(HL)(L-4)] (6) and [Cu-2(L)(OH)(H2O)]center dot 0.5H(2)O (7) (H3L = 5-(benzonic-4-ylmethoxy) isophthalic acid, phen = 1,10-phenathroline, L-1 = 1,2-bis (1,2,4-triazole-1-yl) ethane, L-2 = 1,3-bis(1,2,4-triazole-1-yl) propane, L-3 = 1,6-bis(1,2,4-triazole-1-yl) hexane and L-4 = 4,4'-bis(1,2,4-triazole-1-ylmethyl)biphenyl), have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction. In compounds 1-6, the H3L ligand is partially deprotonated to form HL2-, while it is completely deprotonated in 7. Compound 1 shows a 3D framework with 4-connected (4(2).7.8(3))(2) topology. Compound 2 displays a 1D ribbon structure. The neighboring ribbons are further linked by hydrogen-bonding interactions to form a 3D supramolecular architecture. Compound 3 exhibits a 2D undulated sheet. The sheets are further penetrated into each other to give rise to a 3D polycatenation structure. Compound 4 displays a 2D supramolecular layer structure. Compound 5 shows a 3D (3,6)-connected (4.8)(4.8(2).10(3)) net. Compound 6 reveals a 3D four-fold interpenetrating diamondoid architecture. Compound 7 displays a (3,8)-connected (4.6(2)) (4(4).6(8).8(12).10(4)) topology. These compounds have been characterized by powder X-ray diffractions (PXRD) and thermal gravimetric analyses (TGA). In addition, the photoluminescent behaviours of 1-6 have been investigated in detail.