Synthesis and structure analysis of sandwich complexes of potassium and cesium with benzo-15-crown-5 derivatives
Tóm tắt
Two novel alkali cation sandwich complexes have been constructed by reaction of potassium and cesium picrate with double-armed benzo-15-crown-5 ether 1. Crystals of the K+Pic−2(B15C5) and Cs+Pic−2(B15C5) complexes (Mr = 1339.81, 2865.23) are all yellow prisms which belong to the orthorhombic space group Pna2(1) with a = 25.757(5), b = 12.927(3), c = 37.507(8) Å and a = 25.905(7), b = 12.998(3), c = 39.036(10) Å, Z = 8 and 8 respectively. The every K and Cs cation are 11 and 12-coordinate involving ten crown oxygens [K–O, 2.742(3)–3.031(3) Å, Cs–O, 3.029(9)–3.271(7) Å], one crown carbon for K (K–C, 3.533(5) or 3.496(5)), two crown carbons for Cs (Cs–C, 3.658(10), 3.682(10) or 3.665(13), 3.705(14)). Metal cation had no interaction with picrate. Intermolecular C–H–O hydrogen bonds and π–π face-to-face stacking interactions help to consolidate the crystal packing.
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