A triple helical calcium-based coordination polymer with strong blue fluorescent emission

A hydrothermal reaction of 1,3-dicyanobenzene and Ca(OH)2 yielded a triple helical calcium-based coordination polymer of the formula, C20H25Ca2.50O18.50 (1). The 1,3-benzenecarboxylate anion, found in the final product was generated in situ during the synthesis by the hydrolysis of 1,3-dicyanobenzene. X-ray diffraction study shows that the complex 1 crystallizes in the monoclinic system, C2/c space group, aZ15.5701(5), bZ21.4445(7), cZ17.1601(6) A ° , bZ111.7400(7)8, VZ5322.1(3) A ° 3, ZZ8, DcZ1.651 Mg/m3. The calcium atoms show differences in the coordination environments. Complex 1 emits strong blue fluorescent light (lem(max)Z419 nm) when it is excited by UV light (lex(max)Z316 nm) in the solid state at room temperature. q 2005 Elsevier B.V. All rights reserved.