Polysulfonylamine, LI [1]. Synthese von zwei Kronenether-Komplexen des Kaliumdimesylamids und Kristallstruktur von [K(18-Krone-6)] [N(SO2CH3)2] • 2 CH3OH bei —95°C / Polysulfonylamines, LI. Synthesis of Two Crown Ether Complexes of Potassium Dimesylamide and Crystal Structure of [K(18-Crown-6)][N(SO2CH3)2] • 2 CH3OH at –95°C

Abstract

The complexes [K(18-crown-6)][N(SO2CH3)2] and [K(dibenzo-18-crown-6)][N(SO2CH3)2] are obtained as white solids from equimolar methanolic solutions of KN(SO2CH3)2 and the appropriate crown ether. The former complex crystallizes at -25°C from methanol as a labile (1/2) solvate (title compound). The crystallographic data of the solvate at -95°C are: orthorhombic, space group P 212121, a = 848.2(4), b = 1233.2(4), c = 2496.6(10) pm, V = 2.612 nm3, Z = 4, Dx, = 1.373 Mg m-3. The structure in the solid state consists of ion pairs. The potassium cation is coordinated by the six oxygen atoms of the crown ether and two oxygen atoms belonging to different sulfonyl groups of the anion. The bond distances are K - O(crown) 274.2-297.1 (mean value 288.7), K-O(sulfonyl) 283.8 and 284.5 pm. The potassium ion lies 74 pm out of the best plane of the crown ether oxygen atoms. One methanol molecule acts as a hydrogen-bond donor towards the nitrogen atom of the anion and as a hydrogen-bond acceptor towards the second methanol molecule. The coronand displays the frequently observed symmetry D3d