Issue 1, 2019

Spirocyclic tin salicyl alcoholates – a combined experimental and theoretical study on their structures, 119Sn NMR chemical shifts and reactivity in thermally induced twin polymerization

Abstract

The spirocyclic tin salicyl alcoholate, 4H,4′H-2,2′-spirobi[benzo[d][1,3,2]dioxastannine] (1), and its 6,6′-dimethoxy (2) and 8,8′-di-tert-butyl-6,6′-dimethyl derivative (3) were synthesized and thermally induced twin polymerization of precursor 2 was performed to give a SnO2-containing hybrid material. Studies on the molecular structures of 1–3 were carried out using 119Sn{1H} CP MAS NMR spectroscopy and DFT calculations. Crystallization of compound 3 from dimethyl sulfoxide solution provided the Lewis acid–base adduct 3(dmso)2 exhibiting a hexacoordinated tin atom in the solid state, in agreement with the results of the spectroscopic and DFT calculation data. 119Sn NMR spectroscopy of the compounds 1–3 and 3(dmso)2 revealed equilibria among the diverse oligomers in solution phase pointing at hexacoordinated tin atoms.

Graphical abstract: Spirocyclic tin salicyl alcoholates – a combined experimental and theoretical study on their structures, 119Sn NMR chemical shifts and reactivity in thermally induced twin polymerization

Supplementary files

Article information

Article type
Paper
Submitted
12 Sep 2018
Accepted
21 Nov 2018
First published
22 Nov 2018

Dalton Trans., 2019,48, 220-230

Spirocyclic tin salicyl alcoholates – a combined experimental and theoretical study on their structures, 119Sn NMR chemical shifts and reactivity in thermally induced twin polymerization

P. Kitschke, A. Preda, A. A. Auer, S. Scholz, T. Rüffer, H. Lang and M. Mehring, Dalton Trans., 2019, 48, 220 DOI: 10.1039/C8DT03695K

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