Insights into the Coordination Ability of Siloxanes Employing Partially Silicon Based Crown Ethers: A Comparative Analysis of s-Block Metal Complexes

Inorganic Chemistry
Fabian Dankert, Carsten von Hänisch

Abstract

Herein we present the synthesis and coordination chemistry of the partially silicon based crown ether analogues 1,2,4,5-tetrasila-benzo[15]crown-5 (1) and 1,2,4,5-tetrasila[18]crown-6 (7). Stable complexes of alkali and alkaline earth metal iodides could be obtained showing the good coordination ability of these ligands. The complexes [M A(1,2,4,5-tetrasila-benzo[15]crown-5)I] (M A = Li+ (2), Na+ (4)) and [M EA(1,2,4,5-tetrasila-benzo[15]crown-5)I2] (M EA = Mg2+ (3), Ca2+ (5), Sr2+ (6)) were obtained by equimolar reaction of 1 with the respective alkali or alkaline earth metal iodide. Depending on the ionic radii of the respective cations, the coordination modes of the siloxane backbone are significantly different and could be well-represented by means of 29Si NMR spectroscopy. In addition, we were able to generate the unusual dinuclear complex [Ba2(1,2,4,5-tetrasila[18]crown-6)2I4] (8) by reaction of 7 with BaI2. All compounds were characterized via single crystal X-ray diffraction (XRD) analysis.

References

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Citations

Oct 10, 2019·Chemistry : a European Journal·Fabian DankertCarsten von Hänisch
Apr 22, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Maximilian JostCarsten von Hänisch

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