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Philipp Gütlich - One of the best experts on this subject based on the ideXlab platform.
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effect of Metal dilution on the thermal and light induced spin transition in fexzn1 x mtz 6 clo4 2 mtz 1 methyl 1h tetrazole
Journal of The Chemical Society-dalton Transactions, 1994Co-Authors: Thomas Buchen, Peter Poganiuch, Philipp GütlichAbstract:The thermal and light-induced spin transition in [FexZn1 –x(mtz)6][ClO4]2(mtz = 1-methyl-1H-tetrazole) was studied by 57Fe Mossbauer spectroscopy and magnetic susceptibility measurements. The pure iron compound possesses two different lattice sites A and B for the complex molecules. At temperatures below 100 K a high spin (h.s.)→ low spin (l.s.) transition of the complexes at site A was observed, whereas the B molecules stay in the h.s. state at all temperatures down to 4.2 K. On isotypic dilution with zinc the spin transition was shifted to lower temperatures and became more gradual with decreasing iron content x of the mixed-Metal Crystals. At T⩽ 40 K the l.s. (A) state can be converted by green light into the long-lived metastable h.s. (A) state [light-induced excited spin state trapping (LIESST)(l → h)] and the h.s.(B) state can be converted into a metastable long-lived l.s.(B) state using red light [LIESST (h → l)]. Reverse LIESST using red and green light, respectively, is possible in both cases.
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effect of Metal dilution on the thermal and light induced spin transition in fexzn1 x mtz 6 clo4 2 mtz 1 methyl 1h tetrazole
Journal of The Chemical Society-dalton Transactions, 1994Co-Authors: Thomas Buchen, Peter Poganiuch, Philipp GütlichAbstract:The thermal and light-induced spin transition in [FexZn1 –x(mtz)6][ClO4]2(mtz = 1-methyl-1H-tetrazole) was studied by 57Fe Mossbauer spectroscopy and magnetic susceptibility measurements. The pure iron compound possesses two different lattice sites A and B for the complex molecules. At temperatures below 100 K a high spin (h.s.)→ low spin (l.s.) transition of the complexes at site A was observed, whereas the B molecules stay in the h.s. state at all temperatures down to 4.2 K. On isotypic dilution with zinc the spin transition was shifted to lower temperatures and became more gradual with decreasing iron content x of the mixed-Metal Crystals. At T⩽ 40 K the l.s. (A) state can be converted by green light into the long-lived metastable h.s. (A) state [light-induced excited spin state trapping (LIESST)(l → h)] and the h.s.(B) state can be converted into a metastable long-lived l.s.(B) state using red light [LIESST (h → l)]. Reverse LIESST using red and green light, respectively, is possible in both cases.
Thomas Buchen - One of the best experts on this subject based on the ideXlab platform.
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effect of Metal dilution on the thermal and light induced spin transition in fexzn1 x mtz 6 clo4 2 mtz 1 methyl 1h tetrazole
Journal of The Chemical Society-dalton Transactions, 1994Co-Authors: Thomas Buchen, Peter Poganiuch, Philipp GütlichAbstract:The thermal and light-induced spin transition in [FexZn1 –x(mtz)6][ClO4]2(mtz = 1-methyl-1H-tetrazole) was studied by 57Fe Mossbauer spectroscopy and magnetic susceptibility measurements. The pure iron compound possesses two different lattice sites A and B for the complex molecules. At temperatures below 100 K a high spin (h.s.)→ low spin (l.s.) transition of the complexes at site A was observed, whereas the B molecules stay in the h.s. state at all temperatures down to 4.2 K. On isotypic dilution with zinc the spin transition was shifted to lower temperatures and became more gradual with decreasing iron content x of the mixed-Metal Crystals. At T⩽ 40 K the l.s. (A) state can be converted by green light into the long-lived metastable h.s. (A) state [light-induced excited spin state trapping (LIESST)(l → h)] and the h.s.(B) state can be converted into a metastable long-lived l.s.(B) state using red light [LIESST (h → l)]. Reverse LIESST using red and green light, respectively, is possible in both cases.
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effect of Metal dilution on the thermal and light induced spin transition in fexzn1 x mtz 6 clo4 2 mtz 1 methyl 1h tetrazole
Journal of The Chemical Society-dalton Transactions, 1994Co-Authors: Thomas Buchen, Peter Poganiuch, Philipp GütlichAbstract:The thermal and light-induced spin transition in [FexZn1 –x(mtz)6][ClO4]2(mtz = 1-methyl-1H-tetrazole) was studied by 57Fe Mossbauer spectroscopy and magnetic susceptibility measurements. The pure iron compound possesses two different lattice sites A and B for the complex molecules. At temperatures below 100 K a high spin (h.s.)→ low spin (l.s.) transition of the complexes at site A was observed, whereas the B molecules stay in the h.s. state at all temperatures down to 4.2 K. On isotypic dilution with zinc the spin transition was shifted to lower temperatures and became more gradual with decreasing iron content x of the mixed-Metal Crystals. At T⩽ 40 K the l.s. (A) state can be converted by green light into the long-lived metastable h.s. (A) state [light-induced excited spin state trapping (LIESST)(l → h)] and the h.s.(B) state can be converted into a metastable long-lived l.s.(B) state using red light [LIESST (h → l)]. Reverse LIESST using red and green light, respectively, is possible in both cases.
Schenetti Luisa - One of the best experts on this subject based on the ideXlab platform.
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Reactivity of coordinated nitriles - Formation of the acetamidine complex cis-[(PMe3)(2)Pt{1-MeTyH)}{CH3C(NH)NH2}](+) from the 1-methylthyminate compound cis-[(PMe3)(2)Pt{1-MeTyH)}(CH3CN)](+) - Synthesis, characterisation, and X-ray structures
2001Co-Authors: B. Longato, G. Bandoli, Mucci Adele, Schenetti LuisaAbstract:1-Methylthymine (1-MeTy) reacts reversibly with the hydroxo complexes cis-[(PMe3)(2)Pt(mu -OH)](2)X-2 (X- = NO3; ClO4) in various solvents (S = CH3CN, H2O, DMSO) to give the thyminate derivatives cis-[(PMe3)(2)Pt{1-MeTy(-H)}(S)]X that have been isolated as pure compounds when S is CH3CN. The single-crystal X-ray structure of cis-[(PMe3)(2)Pt{1-MeTy(-H)}(CH3CN)]ClO4 shows that the N(3)-platinated nucleobase acts as a monodentate ligand and a molecule of CH3CN completes the coordination sphere of the Metal. Crystals of the acetamidine derivative cis-[(PMe3)(2)Pt{1-MeTy(-H)}{CH3C(NH)NH2}]X were isolated from an acetonitrile solution of this complex, in the presence of small amounts of water, after several months at room temperature, separated in 5-10% yield. The X-ray analysis of the perchlorate salt shows a configuration of the amidine ligand consistent with a formal trans addition of NH3 to the CN triple bond of the coordinated nitrile. The acetamidine complex was formed in high yield (70%), in a few weeks, when aqueous solution of NH3 was added to cis-[(PMe3)(2)Pt{1-MeTy(-H)}(CH3CN)](+) dissolved in CH3CN. Side products of this reaction are the ammonia complex cis-[(PMe3)(2)Pt{1-MeTy(-H)}(NH3)](+), which was also obtained as pure compound, acetamide, and other platinum containing species. All the isolated complexes were characterised by elemental analysis, IR, and multinuclear NMR spectroscopy
Peter Poganiuch - One of the best experts on this subject based on the ideXlab platform.
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effect of Metal dilution on the thermal and light induced spin transition in fexzn1 x mtz 6 clo4 2 mtz 1 methyl 1h tetrazole
Journal of The Chemical Society-dalton Transactions, 1994Co-Authors: Thomas Buchen, Peter Poganiuch, Philipp GütlichAbstract:The thermal and light-induced spin transition in [FexZn1 –x(mtz)6][ClO4]2(mtz = 1-methyl-1H-tetrazole) was studied by 57Fe Mossbauer spectroscopy and magnetic susceptibility measurements. The pure iron compound possesses two different lattice sites A and B for the complex molecules. At temperatures below 100 K a high spin (h.s.)→ low spin (l.s.) transition of the complexes at site A was observed, whereas the B molecules stay in the h.s. state at all temperatures down to 4.2 K. On isotypic dilution with zinc the spin transition was shifted to lower temperatures and became more gradual with decreasing iron content x of the mixed-Metal Crystals. At T⩽ 40 K the l.s. (A) state can be converted by green light into the long-lived metastable h.s. (A) state [light-induced excited spin state trapping (LIESST)(l → h)] and the h.s.(B) state can be converted into a metastable long-lived l.s.(B) state using red light [LIESST (h → l)]. Reverse LIESST using red and green light, respectively, is possible in both cases.
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effect of Metal dilution on the thermal and light induced spin transition in fexzn1 x mtz 6 clo4 2 mtz 1 methyl 1h tetrazole
Journal of The Chemical Society-dalton Transactions, 1994Co-Authors: Thomas Buchen, Peter Poganiuch, Philipp GütlichAbstract:The thermal and light-induced spin transition in [FexZn1 –x(mtz)6][ClO4]2(mtz = 1-methyl-1H-tetrazole) was studied by 57Fe Mossbauer spectroscopy and magnetic susceptibility measurements. The pure iron compound possesses two different lattice sites A and B for the complex molecules. At temperatures below 100 K a high spin (h.s.)→ low spin (l.s.) transition of the complexes at site A was observed, whereas the B molecules stay in the h.s. state at all temperatures down to 4.2 K. On isotypic dilution with zinc the spin transition was shifted to lower temperatures and became more gradual with decreasing iron content x of the mixed-Metal Crystals. At T⩽ 40 K the l.s. (A) state can be converted by green light into the long-lived metastable h.s. (A) state [light-induced excited spin state trapping (LIESST)(l → h)] and the h.s.(B) state can be converted into a metastable long-lived l.s.(B) state using red light [LIESST (h → l)]. Reverse LIESST using red and green light, respectively, is possible in both cases.
S Suresh - One of the best experts on this subject based on the ideXlab platform.
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cyclic deformation leads to defect healing and strengthening of small volume Metal Crystals
Proceedings of the National Academy of Sciences of the United States of America, 2015Co-Authors: Zhangjie Wang, Yinan Cui, Zhanli Liu, Jun Sun, Zhuo Zhuang, Ming Dao, Zhiwei Shan, S SureshAbstract:When microscopic and macroscopic specimens of Metals are subjected to cyclic loading, the creation, interaction, and accumulation of defects lead to damage, cracking, and failure. Here we demonstrate that when aluminum single Crystals of submicrometer dimensions are subjected to low-amplitude cyclic deformation at room temperature, the density of preexisting dislocation lines and loops can be dramatically reduced with virtually no change of the overall sample geometry and essentially no permanent plastic strain. This “cyclic healing” of the Metal crystal leads to significant strengthening through dramatic reductions in dislocation density, in distinct contrast to conventional cyclic strain hardening mechanisms arising from increases in dislocation density and interactions among defects in microcrystalline and macrocrystalline Metals and alloys. Our real-time, in situ transmission electron microscopy observations of tensile tests reveal that pinned dislocation lines undergo shakedown during cyclic straining, with the extent of dislocation unpinning dependent on the amplitude, sequence, and number of strain cycles. Those unpinned mobile dislocations moving close enough to the free surface of the thin specimens as a result of such repeated straining are then further attracted to the surface by image forces that facilitate their egress from the crystal. These results point to a versatile pathway for controlled mechanical annealing and defect engineering in submicrometer-sized Metal Crystals, thereby obviating the need for thermal annealing or significant plastic deformation that could cause change in shape and/or dimensions of the specimen.