Cation-pi interactions - Synthesis and crystal structure of complexes [K(DB18C6)](2)[M(SCN)(4)](M= Pd,Pt)

Novel dibenzo - 18 - crown - 6 (DB18C6) complexes: [K(DB18C6)](2)[Pd(SCN)(4 )] (1), [K(DB18C6)](2)[Pt(SCN)(4)] (2) have been synthesized and characteri zed by IR, X-ray diffraction analysis. The complexes are all triclinic, spa ce group P -1. The crystal data of 1: a = 0.873 75(17) nm, b = 1.199 0 (2) nm, c = 1.318 0(3) nm, alpha = 73.56(3)degrees, beta = 99.90(3)degrees, gam ma = 82.34(3)degrees, V = 1.298 6(4) nm(3), Z = 1, F(000) = 584, R-1 = 0.07 5 2, wR(2) = 0.166 0. The crystal data of 2: a = 0.855 3(5) nm, b = 1.312 7 (3) nm, c = 1.1819(3)nm, alpha = 106.21(2)degrees, beta = 82.77(3)degrees, gamma = 99.72(3)degrees, V= 1.2516(8)nm(3), Z = 1, F(000) = 818, R-1 = 0.02 5 4, wR(2) = 0.068 2. In the solid state, they display a quasi - one - dime nsional infinite chain of two [K(DB18C6)](+) complex cations and a [M(SCN)( 4)](2-) complex anion bridged by K+ - pi interactions between adjacent [K(D B18C6)](+) units.