✦ LIBER ✦

Relative signs of 29Si13C couplings

✍ Scribed by Vratislav Blechta; Jan Schraml

Publisher: John Wiley and Sons
Year: 2008
Tongue: English
Weight: 239 KB
Volume: 46
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.2241

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

SQ—SQ experiment for determination of re

SQ—SQ experiment for determination of relative signs of small nJ(29Si,13C) couplings in a wide variety of silicon compounds

✍ Vratislav Blechta; Jan Schraml 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 155 KB

## Abstract A modification of double quantum–zero quantum (DQ—ZQ) experiment termed single‐quantum–single‐quantum (SQ—SQ) experiment is proposed for the determination of relative signs and magnitudes of coupling constants. The modification replaces the multiple‐quantum evolution period by two synch

29Si–13C spin–spin couplings over Si–O–C

29Si–13C spin–spin couplings over Si–O–Carom link

✍ Jan Sýkora; Vratislav Blechta; Vladimír Sychrovský; Jiří Hetflejš; Stanislav Šab 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 English ⚖ 124 KB

29Si-13C couplings were measured in para substituted silylated phenols, X--C6H4--O--SiR1R2R3 (X = NO2, CF3, Cl, F, H, CH3, CH3O). The SiR1R2R3 silyl groups included trimethylsilyl (Si(CH3)3, TMS), tert-butyldimethylsilyl (Si(CH3)2C(CH3)3, TBDMS), dimethylsilyl (SiH(CH3)2, DMS), and tert- butyldiphen

Geminal 2J(29Si-O-29Si) couplings in oli

Geminal 2J(29Si-O-29Si) couplings in oligosiloxanes and their relation to direct 1J(29Si-13C) couplings

✍ Milan Kurfürst; Vratislav Blechta; Jan Schraml 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 308 KB

## 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 ar

Determination of relative signs of 13C13

Determination of relative signs of 13C13C coupling constants in doubly labelled compounds

✍ P. E. Hansen; O. K. Poulsen; A. Berg 📂 Article 📅 1975 🏛 John Wiley and Sons 🌐 English ⚖ 187 KB

## Abstract Analysis of the noise decoupled ^13^C spectra of doubly ^13^C labelled compounds where the two labelled carbons are identical, makes the determination of reltive signs of ^13^C^13^C coupling constants possible in a very simple way. The involved carbon form AA'X or AA'B spin systems.

1H-detected studies of geminal 29Si13C c

1H-detected studies of geminal 29Si13C couplings: Dependence of coupling sign and magnitude on molecular structure

✍ Ēriks Kupč; Bernd Wrackmeyer 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 343 KB

## Abstract The magnitude and signs of geminal ^29^SiZ^13^C coupling constants were determined for nine derivatives of representative organosilicon compounds [Z = C(sp^2^, sp^3^), N, O, (two‐ and three‐coordinate), Si, S] from ^1^H‐detected two‐dimensional (2D) Ψ‐BIRD‐HSQC and Ψ‐BIRD‐HMQC pseudo‐

29Si13C spin–spin couplings over an SiOC

29Si13C spin–spin couplings over an SiOCsp3 link

✍ Jan Sýkora; Vratislav Blechta; Ludmila Soukupová; Jan Schraml 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 160 KB

## Abstract ^29^Si^13^C spin–spin couplings over one, two, and three bonds as well as other NMR parameters [δ(^29^Si), δ(^13^C), δ(^1^H), ^1^__J__(^13^C^1^H), and ^2^__J__(^29^SiC^1^H)] were calculated and measured for a series of trimethylsilylated alcohols of the types Me~3~SiO(CH~2~)~__n__