Metal-ligand covalency enables room temperature molecular qubit candidates

Majed S. Fataftah, Matthew D. Krzyaniak, Bess Vlaisavljevich, Michael R. Wasielewski*, Joseph M. Zadrozny, Danna E. Freedman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


Harnessing synthetic chemistry to design electronic spin-based qubits, the smallest unit of a quantum information system, enables us to probe fundamental questions regarding spin relaxation dynamics. We sought to probe the influence of metal-ligand covalency on spin-lattice relaxation, which comprises the upper limit of coherence time. Specifically, we studied the impact of the first coordination sphere on spin-lattice relaxation through a series of four molecules featuring V-S, V-Se, Cu-S, and Cu-Se bonds, the Ph4P+ salts of the complexes [V(C6H4S2)3]2- (1), [Cu(C6H4S2)2]2- (2), [V(C6H4Se2)3]2- (3), and [Cu(C6H4Se2)2]2- (4). The combined results of pulse electron paramagnetic resonance spectroscopy and ac magnetic susceptibility studies demonstrate the influence of greater M-L covalency, and consequently spin-delocalization onto the ligand, on elongating spin-lattice relaxation times. Notably, we observe the longest spin-lattice relaxation times in 2, and spin echos that survive until room temperature in both copper complexes (2 and 4).

Original languageEnglish (US)
Pages (from-to)6707-6714
Number of pages8
JournalChemical Science
Issue number27
StatePublished - 2019

ASJC Scopus subject areas

  • General Chemistry


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