Anions as Connectors for Higher Dimensions. Silver(I) Trifuoracetate with 3,3'-Oxybispyridine vs 3,3'-Thiobispyridine

Abstract

Trifluoroacetate anion as a connector has been studied on AgCF 3 CO 2 compounds with 3,3'-Py 2 X (X = O vs S). The reaction of AgCF 3 CO 2 with 3,3'-Py 2 X (X = O vs S) produces 1 : 1 adducts of [Ag(CF 3 CO 2)(3,3'-Py 2 X)]. Crystallographic characterization of [Ag(CF 3 CO 2)(3,3'-Py 2 O)] (monoclinic P21, a = 7.383(1) Å, b = 19.801(3) Å, c = 9.297(3) Å, β = 100.26(2)º, V = 1337.4(5) Å 3 , Z = 2, R = 0.0386) reveals that the 3,3'-Py 2 O spacer connects two silver ions to give a single strand and that the single strands are linked via the trifluoroacetate anions in an "up and down even-bridge" to give an elegant molecular grid. The framework of [Ag(CF 3 CO 2)(3,3'-Py 2 S)] (monoclinic P2 1 /c, a = 8.331(2) Å, b = 14.010(2) Å, c = 11.926(3) Å, β = 93.70(2)º, V = 1385.1(6) Å 3 , Z = 4, R = 0.0589) is a single-strand. The single strands are connected via the trifluoroacetate anions in a double-bridge, resulting in a typical molecular chicken-wire. The trifluoroacetate anion as a connector appears to be primarily associated with its moderately coordinating ability. Their structural features have been discussed based on the anion exchangeability. Thermal analyses indicate that the compounds are stable up to approximately 200 ºC.