Apparent transverse relaxation rates in systems with scalar-coupled protons.
The modulation of spin echoes by homonuclear scalar couplings render the determination of transverse relaxation rates of individual spins difficult, in particular for molecules that are isotopically enriched in (13)C or (15)N, and for all molecules with scalar-coupled protons. To avoid echo modulations, most studies using refocusing pulses have so far been restricted to isolated (1)H, (13)C, or (15)N spins. We report measurements of apparent (1)H transverse relaxation rates of backbone and side-chain protons in Cyclosporin A (CsA) determined by quenching the echo modulations that arise from homonuclear scalar couplings between protons.
Baishya
Bikash
B
Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, BCH, 1015 Lausanne, Switzerland. bikash.baishya@epfl.ch
Segawa
Takuya F
TF
Bodenhausen
Geoffrey
G