Blue to Red Fluorescent Emission Tuning of a Cadmium Coordination Polymer by Conjugated Ligands

The hydrothermal hydrolysis reactions of Cd(ClO4)2·(6H2O) with 4‐[2‐(2‐pyridyl)ethenyl]benzonitrile (2‐PEBN) and 2‐[2‐(4‐cyanophenyl)ethenyl]‐8‐quinolinol (2‐CEQH) afforded two coordination polymers aquabis{4‐[2‐(2‐pyridyl)ethenyl]benzoate}cadmium(II) (1) and 2‐[2‐(4‐carboxylatophenyl)ethenyl]‐8‐quinolinolate(pyridine)cadmium(II) (2), respectively. Complexes 1 and 2 display strong blue and red fluorescent emission, respectively. Both 1 and 2 have a 2‐D grid framework containing a dimer as the corner unit. Crystal data for 1: monoclinic, P21/c, a = 15.2411(2), b = 19.8651(2), c = 15.6929(1) Å, α = β = 90, γ = 96.961(1)°; for 2: monoclinic, P21/c, a = 11.9219(1), b = 8.9515(1), c = 18.8204(1)Å, α = γ = 90.00, β = 104.372(1)°. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)