Preparation and crystal structure of a binuclear complex of potassium with one molecule of cyclic polyether: bis(potassium thiocyanate)dibenzo-24-crown-8

Abstract

Reaction between potassium thiocyanate and 2,3,14,15-dibenzo-1,4,7,10,13,16,19,22-octaoxocyclotetracosa-2,14-diene gives a 2:1 complex shown by crystal structure analysis to be centrosymmetrical with two potassium ions each positioned among eight sources of electron density, namely, two nitrogen atoms of bridging thiocyanate groups, five oxygen atoms of the cyclic ether (two of the eight oxygen atoms are shared) and two carbon atoms of a benzene ring.