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Updated: Mar 15, 2026
Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
Published on: July 4, 2016
Investigation of Hyperfine Interactions in Molecular Spin Qubits Constructed from A Nitronyl-Nitroxide Ligand and
Daniel O T A Martins1, Cristian A Spinu2,3, Alena Sheveleva1
1Department of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
Abstract:
The qubit behavior of two S = 1/2 heterospin complexes with the general formula (Et3NH)[M(hfac)2L] has been investigated by pulse EPR methods (M = Zn (1) and Ni (2), hfac- is the coligand hexafluoroacetylacetonate and L- is the deprotonated nitrophenol-substituted NIT radical 2-(2-hydroxy-3-methoxy-5-nitrophenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-3-oxide-1-oxyl). Robust quantum coherence is observed in both compounds. At 100 K, 1 shows a longer phase memory time, Tm (0.9 μs) than 2 (0.12 μs), while at very low temperatures, the opposite is true (1: 1.78 μs at 5.2 K; 2: 3.7 μs at 5.5 K). With CPMG detection, longer Tm up to18 μs (1) and 7 μs (2) at 5 K is measured. The spin-lattice relaxation time (T1) is also longer for 1 than for 2, due to strong spin-orbit coupling in the latter. HYSCORE and ENDOR investigations quantified the hyperfine couplings to 19F, 1H, 67Zn, and 14N, providing clear insights into the low temperature decoherence paths in the two qubits.
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