Self-assembly of one Ag(I) 2D metallacrown polymer with bis-bidentate Schiff-base ligand N,N′-bis(furan-2-ylmethylene)hydrazine: Synthesis, crystal structures and luminescent properties

One new coordination polymer, [{Ag2L3(BF4)2}H2O]n (1), has been generated via self-assembly from the ligand LN,N′-bis(furan-2-ylmethylene)hydrazine and AgBF4. The complex 1 and ligand L are characterized by single-crystal X-ray diffraction analysis. Crystal structure analyses show that the complex 1 belongs to the rhombohedral space group R3¯ with a = 9.8999(6) Å, b = 9.8999(6) Å, c = 34.208(4) Å, V = 2903.5(4) Å3 and the ligand L belongs to the orthorhombic space group Pbca with a = 6.9014(12) Å, b = 9.0215(16) Å, c = 15.235(3) Å, V = 948.5(3) Å3. The structure of 1 exhibits a 2D layer hexagonal network with 18-Mc-6 [Ag6L6] metallacrowns as building blocks and every two adjacent silver atoms are bridged through the two nitrogen atoms of N–N bridge of a ligand. Luminescence studies revealed that L and complex 1 exhibit fluorescent emissions in the solid state at room temperature at λmax = 348 and 506 nm, respectively.