Silver(I) complexes with (1-pyrazolyl)pyridazine ligands: Synthesis, crystal structures and luminescent properties

Four Ag(I) coordination complexes formulated as {[Ag(L1)(ClO4)]}n (1), {[Ag(L1)(NO3)]}n (2), {[Ag(L1)(PF6)]}2 (3) and {[Ag(L2)](ClO4)·CH3OH}n (4), (L1 = 3,6-bis(1-pyrazolyl)pyridazine, L2 = 3,6-bis(3,5-dimethyl-1-pyrazolyl)pyridazine) have been synthesized in the presence of different anions [ClO4− (1) and (4), NO3− (2), PF6− (3)] and structurally characterized by FT-IR spectra, elemental analysis and X-ray diffraction. Studies of X-ray diffraction reveal that complexes 1, 2 and 4 show infinite helical chains, which are the alternate left- and right-handed helical chains. Furthermore, helical chains are arranged to 2D sheet via C–H⋯O (from anion O atoms) hydrogen bonds. As the anion changed to PF6−, a dinuclear molecule is formed in complex 3, further constructing a 2D sheets by C–H⋯F hydrogen bonds. The photoluminescence properties of all the complexes 1–4 have been investigated in the solid state at room temperature.

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