An EPR study of various compounds of copper (II) and silver (II)

Abdrakhmanov, R. S.; Garif'yanov, N. S.; Semenova, E. I.

doi:10.1007/bf00523918

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…In fact, an increase in line broadening is observed in the spectra for all of the MOF compositions. Two additional peaks observed at low field in the lower temperature spectra (−50 to −150 °C) for the 1:99 and 1:9 ratio samples are assigned to residual copper(II) ions, which are found as trace impurities in the synthesis . These signals did not appear in the 3:1, 1:1, and 1:3 samples where the nitroxide radicals are present in much higher concentration.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Two additional peaks observed at low field in the lower temperature spectra (−50 to −150 °C) for the 1:99 and 1:9 ratio samples are assigned to residual copper(II) ions, which are found as trace impurities in the synthesis. 28 These signals did not appear in the 3:1, 1:1, and 1:3 samples where the nitroxide radicals are present in much higher concentration. Moving from top to bottom in Figure 4B as the samples change from low to high nitroxide concentrations, the spectra become increasingly broadened.…”

Section: ■ Introductionmentioning

confidence: 92%

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2D Arrays of Organic Qubit Candidates Embedded into a Pillared-Paddlewheel Metal–Organic Framework

et al. 2020

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The creation of ordered arrays of qubits that can be interfaced from the macroscopic world is an essential challenge for the development of quantum information science (QIS) currently being explored by chemists and physicists. Recently, porous metal–organic frameworks (MOFs) have arisen as a promising solution to this challenge as they allow for atomic-level spatial control of the molecular subunits that comprise their structures. To date, no organic qubit candidates have been installed in MOFs despite their structural variability and promise for creating systems with adjustable properties. With this in mind, we report the development of a pillared-paddlewheel-type MOF structure that contains 4,7-bis(2-(4-pyridyl)-ethynyl) isoindoline N-oxide and 1,4-bis(2-(4-pyridyl)-ethynyl)-benzene pillars that connect 2D sheets of 9,10-dicarboxytriptycene struts and Zn2(CO2)4 secondary binding units. The design allows for the formation of ordered arrays of reorienting isoindoline nitroxide spin centers with variable concentrations through the use of mixed crystals containing the secondary 1,4-phenylene pillar. While solvent removal causes decomposition of the MOF, magnetometry measurements of the MOF containing only N-oxide pillars demonstrated magnetic interactions with changes in magnetic moment as a function of temperature between 150 and 5 K. Variable-temperature electron paramagnetic resonance (EPR) experiments show that the nitroxides couple to one another at distances as long as 2 nm, but act independently at distances of 10 nm or more. We also use a specially designed resonance microwave cavity to measure the face-dependent EPR spectra of the crystal, demonstrating that it has anisotropic interactions with impingent electromagnetic radiation.

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Section: Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 92%

2D Arrays of Organic Qubit Candidates Embedded into a Pillared-Paddlewheel Metal–Organic Framework

et al. 2020

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“…The dynamic properties for the Ag II cation have only been studied for one silver(II) tetratolylporphyrin complex by pulsed electron paramagnetic resonance (EPR) in 1996, but the alternating-current (ac) response for this cation has never been measured maybe because Ag II has been considered the weird analogue of the most studied Cu II cation. However, it has large differences with respect to other S = 1 / 2 cations because it has electronic and nuclear spins of 1 / 2 , moderate anisotropy, strong spin polarization of the neighboring ligands, and large spin delocalization, derived from its diffuse 4d orbitals, as has been shown by continuous-wave EPR experiments. − …”

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confidence: 99%

Slow Magnetic Relaxation in Silver(II) Macrocyclic Systems

Serra,

Font-Bardia,

Escuer

et al. 2023

Inorg. Chem.

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The spin–lattice relaxation time has been studied trough alternating-current susceptometry and ultralow-frequency Raman spectroscopy in a family of silver(II)-derived molecular systems with spin 1/2 and formulas [AgII(m-CTH)(NO3)2] (1) and [AgII(m-CTH)(ClO4)2] (2), where CTH = meso-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane. The combination of both techniques demonstrates the occurrence of slow spin magnetic relaxation induced by spin–phonon interaction. The magnetic behavior of these silver(II)-derived systems opens the door to a new cation in the scarce family of S = 1/2 systems with slow relaxation of magnetization.

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An EPR study of various compounds of copper (II) and silver (II)

Cited by 2 publications

References 5 publications

2D Arrays of Organic Qubit Candidates Embedded into a Pillared-Paddlewheel Metal–Organic Framework

2D Arrays of Organic Qubit Candidates Embedded into a Pillared-Paddlewheel Metal–Organic Framework

Slow Magnetic Relaxation in Silver(II) Macrocyclic Systems

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