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Geminal ^2^ J (^29^Si‐O‐^29^Si) couplings in oligosiloxanes and their relation to direct ^1^ J (^29^Si‐^13^C) couplings by Milan Kurfürst; Vratislav Blechta; Jan Schraml is a Chemistry article available to read on EtoBox.

What is Geminal ^2^ J (^29^Si‐O‐^29^Si) couplings in oligosiloxanes and their relation to direct ^1^ J (^29^Si‐^13^C) couplings about?

## Abstract Absolute values of (79) geminal ^2^__J__(^29^Si‐O‐^29^Si) couplings were measured in an extensive series of (55) unstrained siloxanes dissolved in chloroform‐__d__. Signs of ^2^__J__(^29^Si‐O‐^29^Si) in some (9) silicon hydrides were determined relative to ^1^__J__(^29^Si‐^1^H) which are known to be negative. It is supposed that positive sign of the ^2^__J__(^29^Si‐O‐^29^Si) coupling found in all studied hydrides is common to all siloxanes. Theoretical calculations for simple model compounds failed to reproduce this sign and so their predictions of bond length and angle dependences cannot be taken as reliable. Useful empirical correlations were found between the ^2^__J__(^29^Si‐O‐^29^Si) couplings on one side and the total number __m__ of oxygen atoms bonded to the silicon atoms, sum of ^29^Si chemical shifts or product of ^1^__J__(^29^Si‐^13^C) couplings on the other side. The significance of these correlations is briefly discussed. Copyright © 2011 John Wiley & Sons, Ltd.

Who reads Geminal ^2^ J (^29^Si‐O‐^29^Si) couplings in oligosiloxanes and their relation to direct ^1^ J (^29^Si‐^13^C) couplings?

Author

Milan Kurfürst; Vratislav Blechta; Jan Schraml

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; John Wiley and Sons Ltd; Wiley (ISSN 0749-1581)

Published

2011

Language

EN

Field

Chemistry (Physical Sciences)