Two Molecular Tapes Consisting of Serial or Parallel Azido‐Bridged Eight‐Membered Copper Rings

Magnetic attraction: The exotic 1D molecular tapes [Cu4(N3)8(CH3CN)3(bzp)2]n (1) and [Cu5(N3)10(bzp)2]n (2) were obtained from a solution of methanol or methanol/acetonitrile (see scheme; bzp=2-benzoylpyridyl). The end-on azide bridges in 1 transmit ferromagnetic interaction, whereas in 2, the central copper center of a linear Cu5 unit is antiferromagnetically coupled with its neighboring Cu ions.