Abstract
Molecular magnetism has made a long journey, from the fundamental studies on through-ligand electron exchange magnetic interactions in dinuclear metal complexes with extended organic bridges to the more recent exploration of their electron spin transport and quantum coherence properties. Such a field has witnessed a renaissance of dinuclear metallacyclic systems as new experimental and theoretical models for single-molecule spintronics and quantum computing, due to the intercrossing between molecular magnetism and metallosupramolecular chemistry. The present review reports a state-of-the-art overview as well as future perspectives on the use of oxamato-based dicopper(II) metallacyclophanes as promising candidates to make multifunctional and multiresponsive, single-molecule magnetic (nano)devices for the physical implementation of quantum information processing (QIP). They incorporate molecular magnetic couplers, transformers, and wires, controlling and facilitating the spin communication, as well as molecular magnetic rectifiers, transistors, and switches, exhibiting a bistable (ON/OFF) spin behavior under external stimuli (chemical, electronic, or photonic). Special focus is placed on the extensive research work done by Professor Francesc Lloret, an outstanding chemist, excellent teacher, best friend, and colleague, in recognition of his invaluable contributions to molecular magnetism on the occasion of his 65th birthday.
Highlights
Introduction and BackgroundMolecular Magnetism Meets Metallosupramolecular Chemistry for Single-Molecule Spintronics and Quantum ComputingThe metallosupramolecular chemistry term was coined by Constable in 1994 to describe an emerging research area in the field of supramolecular chemistry [1,2], where the advantage of Magnetochemistry 2020, 6, 69; doi:10.3390/magnetochemistry6040069 www.mdpi.com/journal/magnetochemistryMagnetochemistry 2020, 6, x FOR PEER REVIEW
Metallosupramolecular Chemistry Acts as a Rail from SingleMolecule Spintronics to Quantum Computing
The chemical, electroand photo-chemical reactivities of the metal centers and/or the ligand spacers, their ability to respond to changes in chemical and electrochemical potential or photoexcitation, and the geometrical features that allow positioning of substituent groups, allow for the exploration of a vast amount of molecular magnetic wires (MWs) and switches (MSs) [19,20,21,22,23,24,25,26,27,28]
Summary
The metallosupramolecular chemistry term was coined by Constable in 1994 to describe an emerging research area in theto field ofthe supramolecular where the systems advantage of coordination chemistry is taken control metal-directed chemistry assembly of[1,2], supramolecular [3,4,5,6,7,8,9,10]. Two unique examples of complexes which have been proposed as prototypes of molecular magnetic transistors (MTs) and divanadium(IV). The p-phenylenediamidocatecholate-bridged divanadyl(IV) metallacyclic complex of the cyclophane type of formula (Ph4 P)4 [(VO) (μ-ppbacat)2 ] [ppbacat = N,N0 -bis(2,3dihydroxybenzoyl)-1,4-phenylendiamine] reported by Atzori et al allows for the electron spin-mediated. Magnetochemistry 2020, 6, 69 complex of the cyclophane type of formula (Ph4P)4[(VO)2(μ-ppbacat)2] [ppbacat = N,N′-bis(2,3dihydroxybenzoyl)-1,4-phenylendiamine] reported by Atzori et al allows for the electron spinswitching switching of the nuclear spins of each. II assisted chemical switching of the magnetic coupling after coordination of the Zn ion to the central linker,linker, to give [ZnCu as shown in Figure 3 [97]. Is the origin of the weak butof non-negligible copper(II)-salphen fragments at a short intermetallic distance (r = 4.03 Å) is the origin the weak but antiferromagnetic coupling found in the closed isomer
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