Accessing long-lived disconnected spin-1/2 eigenstates through spins > 1/2.

Journal Article

Pairs of chemically equivalent (or nearly equivalent) spin-1/2 nuclei have been shown to create disconnected eigenstates that are very long-lived compared with the lifetime of pure magnetization (T1). Here the classes of molecules known to have accessible long-lived states are extended to include those with chemically equivalent spin-1/2 nuclei accessed by coupling to nuclei with spin > 1/2, in this case deuterium. At first, this appears surprising because the quadrupolar interactions present in nuclei with spin > 1/2 are known to cause fast relaxation. Yet it is shown that scalar couplings between deuterium and carbon can guide population into and out of long-lived states, i.e., those immune from the dominant relaxation mechanisms. This implies that it may be practical to consider compounds with (13)C pairs directly bound to deuterium (or even (14)N) as candidates for storage of polarization. In addition, experiments show that simple deuteration of molecules with (13)C pairs at their natural abundance is sufficient for successful lifetime measurements.

Full Text

Duke Authors

Cited Authors

  • Claytor, K; Theis, T; Feng, Y; Yu, J; Gooden, D; Warren, WS

Published Date

  • October 15, 2014

Published In

Volume / Issue

  • 136 / 43

Start / End Page

  • 15118 - 15121

PubMed ID

  • 25229309

Electronic International Standard Serial Number (EISSN)

  • 1520-5126

International Standard Serial Number (ISSN)

  • 0002-7863

Digital Object Identifier (DOI)

  • 10.1021/ja505792j

Language

  • eng