Category: Research Highlight

Hexamethoxyphenalenyl as a Possible Quantum Spin Simulator: An Electronically Stabilized Neutral π Radical with Novel Quantum Coherence Owing to Extremely High Nuclear Spin Degeneracy

Angew. Chem. Int. Ed., 52, published on the web on April 2, 2013 DOI:10.1002/anie.201301435 A phenalenyl radical with six methoxy groups, which were introduced symmetrically, has been synthesized. The extensively delocalized and highly symmetric lectronic-spin system was studied with advanced cw-/pulsed-ESR techniques, thereby giving an experimental model to explore molecular quantum spin simulators with novel quantum coherence attributable to the extremely high degeneracy of the nuclear spin states owing to the eighteen equivalent protons.

Prof. Takeji Takui Receives 2013 Bruker Prize

The Electron Spin Resonance (ESR) Spectroscopy Group of the Royal Society of Chemistry (RSC) has honored Professor Takeji Takui (Graduate School of Science, Osaka City University, Japan) with the 2013 Bruker Prize. Professor Takui has the honor of an invitation to give the Bruker Prize Lecture at the 46th Annual International Meeting of the ESR Spectroscopy Group of the RSC held at the University of Warwick from 7th – 11th April 2013. To a related web page

A Synthetic Two-Spin Quantum Bit: g-Engineered Exchange-Coupled Biradical Designed for Controlled-NOT Gate Operations

Angew. Chem. Int. Ed., 51, pp.9860-9864 (2012)DOI:10.1002/anie.201204489 A quantum gate: A system of two coupled electron spins that is useful for simple quantum computing operations has been prepared by synthesis of a biradical 1 and co-crystallization with an isomorphous host molecule. The two weakly exchange-coupled quantum bits (target qubit blue and control qubit red) span four electron spin states. The electron spin transition is denoted by two black arrows.

Pulsed electron spin nutation spectroscopy of weakly exchange-coupled biradicals: a general theoretical approach and determination of the spin dipolar interaction

Phys. Chem. Chem. Phys., 14, pp.9137-9148 (2012)DOI:10.1039/c2cp40778g Weakly exchange-coupled biradicals have attracted much attention in terms of their DNP application in NMR spectroscopy for biological systems or the use of synthetic electron-spin qubits. Pulse-ESR based electron spin nutation (ESN) spectroscopy applied to biradicals is generally treated as transition moment spectroscopy from the theoretical side, illustrating that it is a powerful and facile tool to determine relatively short distances between weakly exchange-coupled electron spins. The nutation frequency as a function of the microwave irradiation strength ω1 (angular frequency) for any cases of weakly exchange-coupled systems can be classified into three categories; D12 (spin dipolar interaction)-driven, Δg-driven and ω1-driven nutation behaviour with […]