English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Tin-nitrogen heterocycles [1,3,2,4λ 2 -diazasila- (1), -λ 4 -stannetidines (2), spiro-compounds (3, 4), 1,3,2λ 4 ,4λ 4 -diazadistannetidines (5), 1,3,4,5,2λ 2 -diazadisila- (6) and -λ 4 -stannolidines (7)] have been characterized by  13 C,  15 N,  29 Si and  119 Sn NMR spectroscopy [chemical shifts δX and coupling constants  n J( 119 Sn-X) (n = 1, 2, 3; X =  13 C,  15 N,  29 Si,  119 Sn]. The influence of the ring size becomes apparent in particular by comparison of the various coupling constants. In the compounds 1 and 6 the presence of a two-coordinate tin atom is reflected by the extremely low shielding of the  119 Sn nuclei and also by the reduced shielding of the  29 Si nucleus. The comparison with δ( 29 Si) data for corresponding non-cyclic compounds indicates that the latter effect may be traced to intra-annular interactions in 1 and 6 which involve the lone electron pair at the tin atom.

zeitschrift für naturforschung b

Synthese und Multikern-NMR-Spektroskopie einiger vier-und fünfgliedriger Zinn—Stickstoff-Heterocyclen / Synthesis and Multinuclear NMR Spectroscopy of Some Four-and Five-Membered Tin —Nitrogen Heterocycles