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Four new complexes, namely, Cu 2 (O-cpia)(btb) 0.5 ·(OH) (1), Cu 3 (O-cpia) 2 (bpy) 2 (2), [Ni 2 (O-cpia)(phen)·(OH)·H 2 O]·2H 2 O (3) and [Ni 3 (O-cpia) 2 (bpy) 3 ·2H 2 O]·2H 2 O (4) (O-cpia = 5-(2-carboxyphenoxy)isophthalic acid, btb = 1,4-bis(1,2,4-triazol-1-yl)butane, bpy = 4,4'-bipyridine) were successfully isolated under hydrothermal conditions. The four complexes exhibit different architectures constructed from different homometallic clusters varying from mononuclear, binuclear to tetranuclear metal(ii) polyhedra as Second Building Blocks (SBUs). 1 features a 3D framework constructed from the tetranuclear clusters [Cu 4 (μ 3 -OH) 2 ] as SBUs, linked with Cu(1)O 4 N and Cu(2)O 5 polyhedra by O-cpia/btb mixed linkers. 2 also exhibits a 3D structure based on trinuclear clusters [Cu 3 (COO) 4 ] SBUs, bridged with Cu(1)O 3 N 2 and Cu(2)O 4 polyhedra via O-cpia/bpy mixed ligands. 3 shows a 2D network consisting of tetranuclear clusters [Ni 4 (μ 3 -OH) 2 ] SBUs, which are bridged with Ni(1)O 4 N 2 and Ni(2)O 6 through O-cpia ligands. It is worth noting that 4, with a 3D structure, is generated from the binuclear clusters [Ni 2 (COO) 4 ] (Ni(1)O 4 N) and mononuclear metal Ni(2) cores (Ni(2)O 4 N 2 ) as SBUs, and bridged by O-cpia/bpy mixed ligands. Meanwhile, the degradation of dyes (RhB) by the complexes under visible light irradiation was studied. 1-4 are semiconducting in nature, with E  g of 1.30 eV (1), 1.78 eV (2), 2.85 eV (3) and 2.14 eV (4). Cu(ii) complexes 1 and 2 are highly efficient photocatalysts for the degradation of RhB under visible light irradiation.

rsc advances

Cu(<scp>ii</scp>)/Ni(<scp>ii</scp>)–organic frameworks constructed from the homometallic clusters by 5-(2-carboxyphenoxy)isophthalic acid and N-ligand: synthesis, structures and visible light-driven photocatalytic properties

Cu(ii)/Ni(ii)–organic frameworks constructed from the homometallic clusters by 5-(2-carboxyphenoxy)isophthalic acid and N-ligand: synthesis, structures and visible light-driven photocatalytic properties