A meso-helical coordination polymer from achiral dinuclear [Cu2(H3CCN)2(μ-pydz)3][]PF6]2 and 1,3-bis(diphenylphosphanyl)propane-synthesis and crystal structure of ∞1{[Cu(μ-pydz)2][PF6]} (pydz = pyridazine)

Reaction of achiral [Cu-2(H3CCN)(2)(mu -pydz)(3)][PF6](2) (1) (pydz=pyridazine) with bidendate 1,3-bis(diphenylphosphanyl)propane (2) in acetonitrile at room temperature in a 1:1 ratio yielded the mononuclear copper(i) complex [Cu{CH2(CH2PPh2)(2)}(2)][PF6] (3) together with new one-dimensional coordination polymer (1)(infinity){[Cu(mu -pydz)(2)][PF6]} (4). Air-sensitive single crystals of 4, suitable for X-ray structure determination, were grown from a mixture of dichloromethane/hexane [crystal system: monoclinic; space group: C2/c; a=21.910(3), b=12.130(2), c=25.704(3) Angstrom, beta =110.08(10)degrees, V=6416.65(16) Angstrom (3)]. The one-dimensional coordination polymer (1)(infinity){[Cu(mu -pydz)(2)][PF6]} (4) exhibits as outstanding feature the rare structure of a meso-helix.