Abstract A new modification of CuI · py was prepared by the reaction of a saturated solution of CuI in CH3CN with a solution of pyridine in ethanol at 60 °C. It crystallizes monoclinic with four formula units in the space group P21/c. (CuI · py)∞ forms a polymeric ribbon structure. Contrary to the cubane-like tetrameric modification, (CuI · py)∞ does not show luminescence thermochromism. The luminescence properties of both modifications of Cul · py are interpreted.
The 2:1 adduct of Cui and 2-methyl pyridine (pic) can be prepared from a stoichiometric mixture of Cui in CH 3 CN and pic in ethanol at 60 °C. It forms colorless, airstable needles, which show a red luminescence (An,^ = 15200 cm" 1 ). (Cul) 2 • pic crystallizes monoclinic in the space group P2Jc with the lattice constants a = 422.5(2) pm, b = 1079.2(3) pm, c = 2190.7(7) pm, β = 92.67(4)°, Ζ = 4. It has a "double ribbon" structure with alternating Cu and I atoms. The Cu atoms are tetrahedral coordinated by 41 atoms or 31 atoms and one pic, respectively.
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