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All compounds have been isolated as air\u2010stable materials and characterised by <jats:sup>1<\/jats:sup>H, <jats:sup>13<\/jats:sup>C, <jats:sup>119<\/jats:sup>Sn and <jats:sup>119<\/jats:sup>Sn MAS (<jats:bold>5<\/jats:bold>) NMR spectroscopy, ESIMS spectrometry, elemental analysis and by single\u2010crystal X\u2010ray diffraction analysis. The molecular structures of <jats:bold>3<\/jats:bold>\u2013<jats:bold>5<\/jats:bold> show that the tin(IV) cation fits perfectly into the crown ether cavity and is coordinated by the five oxygen atoms of the ring to give a pentagonal bipyramidal configuration about the central metal cation. Notably, compounds <jats:bold>4<\/jats:bold> and <jats:bold>5<\/jats:bold> contain the first monomeric monoorganotin dication. Moreover, there are <jats:sup>3<\/jats:sup><jats:italic>J<\/jats:italic>(<jats:sup>1<\/jats:sup>H,<jats:sup>119<\/jats:sup>Sn) coupling constants to the CH<jats:sub>2<\/jats:sub>C<jats:italic>H<\/jats:italic> proton of 377 (<jats:bold>3<\/jats:bold>) and 470\u2005Hz (<jats:bold>4<\/jats:bold>, <jats:bold>5<\/jats:bold>) that are, to the best of our knowledge, the biggest such couplings ever reported.<\/jats:p>","DOI":"10.1002\/chem.200903572","type":"journal-article","created":{"date-parts":[[2010,6,2]],"date-time":"2010-06-02T12:41:41Z","timestamp":1275482501000},"page":"8140-8146","source":"Crossref","is-referenced-by-count":16,"title":["The First Examples of a Crown Ether Intramolecularly Encapsulating Mono\u2010 and Diorganotin Dications: Synthesis and Structures of [PhSnCH<sub>2<\/sub>([16]crown\u20105)][ClO<sub>4<\/sub>]<sub>2<\/sub> and [HOSnCH<sub>2<\/sub>([16]crown\u20105)][Y]<sub>2<\/sub> (Y=ClO<sub>4<\/sub>, CF<sub>3<\/sub>SO<sub>3<\/sub>)"],"prefix":"10.1002","volume":"16","author":[{"given":"Alain\u2005Charly","family":"Tagne\u2005Kuate","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Markus","family":"Sch\u00fcrmann","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dieter","family":"Schollmeyer","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wolf","family":"Hiller","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Klaus","family":"Jurkschat","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2010,7,12]]},"reference":[{"key":"e_1_2_6_1_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF00658982"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF00658981"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF00658980"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr020080k"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr00094a008"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1080\/00958979908024554"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1080\/00958979608028173"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF00973236"},{"key":"e_1_2_6_9_2","doi-asserted-by":"publisher","DOI":"10.2116\/analsci.12.37"},{"key":"e_1_2_6_10_2","doi-asserted-by":"publisher","DOI":"10.1016\/0040-6031(92)80146-N"},{"key":"e_1_2_6_11_2","doi-asserted-by":"publisher","DOI":"10.1080\/00958979908048471"},{"key":"e_1_2_6_12_2","doi-asserted-by":"publisher","DOI":"10.1080\/00958979908023586"},{"volume-title":"Synthesis of Macrocycles: The Design of Selective Complexing Agents","year":"1987","author":"Potvin P. 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