SQSQh: 1H-detected SQ-SQ Experiment for Determination of Signed Silicon-Carbon Coupling Constants

0352963 - ÚCHP 2011 RIV GB eng J - Journal Article
Blechta, Vratislav - Schraml, Jan
SQSQh: 1H-detected SQ-SQ Experiment for Determination of Signed Silicon-Carbon Coupling Constants.
Magnetic Resonance in Chemistry. Roč. 48, č. 6 (2010), s. 464-470. ISSN 0749-1581. E-ISSN 1097-458X
R&D Projects: GA AV ČR IAA400720706
Institutional research plan: CEZ:AV0Z40720504
Keywords : nmr * sqsq sequence * sign of coupling constant
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 1.247, year: 2010

A new variant of SQ-SQ pulse sequence (SQSQh) for relative sign determination and detection of small silicon-carbon couplings over more than one-bond is presented. In the SQSQh sequence proton detection replaces carbon detection used in the original SQ-SQ pulse sequence (SQSQc). The theoretical gain in sensitivity was experimentally tested on two samples (trimelthylsiloxyethane, 1, and 1,2,4-tris(trimethylsiloxy)benzene, 2), the experimentally found gain provided by the SQSQh over the SQSQc method varied between 6 to 8. The method can be applied to linear spin systems, i.e., to systems where the silicon is coupled to the carbon in question and to any hydrogen not necessarily bonded the carbon.
Permanent Link: http://hdl.handle.net/11104/0192331