Etude du radical nitroxyde tétramethyl-2,3,6,6 piperidine-l oxyle-1 ou `tanane'. I. Polymorphisme et étude des transitions

Bordeaux, D.; Capiomont, A.; Lajzérowicz-Bonneteau, J.; Jouve, M.; Thomas, Michael

doi:10.1107/s0567740874006649

Cited by 15 publications

(4 citation statements)

References 2 publications

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“…The analysis of the TEMPO geometry in compound 2, specifically the nitroxide group with the N1-O4 distance of 1.296(2) Å, indicates similarities to other Ln-TEMPO coordination compounds, [64][65][66] and confirms that TEMPO retains its radical character in 2. 67 Figure 1. The crystal structure diagrams of the complexes 1 (a), 2 (b), 3 (c) and 4 (d) with selected atom labelling scheme and the structural formulae of the ligands used in this study (e): TTBP (compounds 1 and 2), TEMPO (compound 2), BHT (compound 3) and N3N (compound 4).…”

Section: Resultsmentioning

confidence: 99%

Pseudo-Tetrahedral vs Pseudo-Octahedral ErIII Single Molecule Magnets and the 'Disruptive' Role of Coordinated TEMPO Radicals

Brzozowska¹,

Handzlik²,

Kurpiewska³

et al. 2021

Preprint

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Erbium(III) complexes are the most interesting candidates for high-performance single molecule magnets (SMMs) just after dysprosium(III). Herein, we thoroughly explore the underrepresented class of neutral pseudo-tetrahedral erbium(III) SMMs and demonstrate their exceptional slow magnetization dynamics controlled by the Raman relaxation mechanism and the molecular magnetic memory effect in the form of a waist-restricted magnetic hysteresis loop. The influence of the coordinated TEMPO radical on the slow magnetization relaxation performance is also demonstrated and discussed.<br>

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Section: Resultsmentioning

confidence: 99%

Pseudo-Tetrahedral vs Pseudo-Octahedral ErIII Single Molecule Magnets and the 'Disruptive' Role of Coordinated TEMPO Radicals

Brzozowska¹,

Handzlik²,

Kurpiewska³

et al. 2021

Preprint

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“…The values k diff , k et , and k el n n were taken from the same publication 42 ] the density calculated from the crystal structure reported herein is 1.612 g cm À3 . Since the density of TEMPO is 1.05 g cm À3 , 44 was predicted 7,36 to be 1.3 Â 10 À4 O À1 cm À1 in this model.…”

Section: Electron Transfer Self-exchange Rates and Predicted Conducti...mentioning

confidence: 83%

Electrical conductivity in two mixed-valence liquids

Yao

Kelley

Rogers

et al. 2015

Phys. Chem. Chem. Phys.

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Two different room-temperature liquid systems were investigated, both of which conduct a DC electrical current without decomposition or net chemical transformation. DC electrical conductivity is possible in both cases because of the presence of two different oxidation states of a redox-active species. One system is a 1 : 1 molar mixture of n-butylferrocene (BuFc) and its cation bis(trifluoromethane)sulfonimide salt, [BuFc(+)][NTf2(-)], while the other is a 1 : 1 molar mixture of TEMPO and its cation bis(trifluoromethane)sulfonimide salt, [TEMPO(+)][NTf2(-)]. The TEMPO-[TEMPO(+)][NTf2(-)] system is notable in that it is an electrically conducting liquid in which the conductivity originates from an organic molecule in two different oxidation states, with no metals present. Single-crystal X-ray diffraction of [TEMPO(+)][NTf2(-)] revealed a complex structure with structurally different cation-anion interactions for cis- and trans [NTf2(-)] conformers. The electron transfer self-exchange rate constant for BuFc/BuFc(+) in CD3CN was determined by (1)H NMR spectroscopy to be 5.4 × 10(6) M(-1) s(-1). The rate constant allowed calculation of an estimated electrical conductivity of 7.6 × 10(-5)Ω(-1) cm(-1) for BuFc-[BuFc(+)][NTf2(-)], twice the measured value of 3.8 × 10(-5)Ω(-1) cm(-1). Similarly, a previously reported self-exchange rate constant for TEMPO/TEMPO(+) in CH3CN led to an estimated conductivity of 1.3 × 10(-4)Ω(-1) cm(-1) for TEMPO-[TEMPO(+)][NTf2(-)], a factor of about 3 higher than the measured value of 4.3 × 10(-5)Ω(-1) cm(-1).

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“…2,2,6,6-Tetramethylpiperidyl-1-oxyl (TEMPO) is known to exist in three polymorphic forms, namely, the monoclinic, orthorhombic, and tetragonal forms. , The reason behind its polymorphic forms is the conformational flexibility of the N–O group and the steric hindrance caused by the t -alkyl groups . Plate-shaped crystals of TEMPO were obtained by sublimation at 4 °C.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Organoferroelasticity in a TEMPO Crystal

Ranjan

Takamizawa

2021

Crystal Growth & Design

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For ferroelastic deformation, twinning facilitates the plastic shape change, leaving spontaneous strain. The twinning is common in metal solids in their microstructures and, recently, has been found in organic solids under a single-crystal state. To actualize multiferroicity in organic molecular materials, the crystals consisting of organic free radicals can be candidates, bringing magnetic properties in organoferroelastic solids. Herein, we demonstrated the organoferroelastic deformation of organic radical crystals of (2,2,6,6tetramethylpiperidin-1-yl)oxyl (TEMPO) characterized by force measurements and single-crystal X-ray diffraction analysis.

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Etude du radical nitroxyde tétramethyl-2,3,6,6 piperidine-l oxyle-1 ou `tanane'. I. Polymorphisme et étude des transitions

Cited by 15 publications

References 2 publications

Pseudo-Tetrahedral vs Pseudo-Octahedral ErIII Single Molecule Magnets and the 'Disruptive' Role of Coordinated TEMPO Radicals

Pseudo-Tetrahedral vs Pseudo-Octahedral ErIII Single Molecule Magnets and the 'Disruptive' Role of Coordinated TEMPO Radicals

Electrical conductivity in two mixed-valence liquids

Characterization of Organoferroelasticity in a TEMPO Crystal

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