Thermodynamic properties of dicarbonyl rhodium o-semiquinonate complex whose crystals display photomechanical properties

Смирнова, Н. Н.; Abakumov, G. A.; Cherkasov, V. K.; Kozhanov, Konstantin A.; Arapova, А. V.; Bubnov, M. P.

doi:10.1016/j.jct.2005.07.023

Cited by 7 publications

(6 citation statements)

References 5 publications

(9 reference statements)

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“…Previously, we have communicated the thermodynamic investigation of complex 2 by precise calorimetry. 24 It was shown that the reversible phase transition takes place in the temperature interval 205–234 K (Δ tr H ° = 225.1 J·mol –1 ) which is in good agreement with structural results. It evidences that this phase transition has structural origin.…”

Section: Resultssupporting

confidence: 79%

“…Thus, according to X-ray data, the phase transition of complex 2 is reversible and passes without the crystal destruction. Previously, we have communicated the thermodynamic investigation of complex 2 by precise calorimetry . It was shown that the reversible phase transition takes place in the temperature interval 205–234 K (Δ tr H ° = 225.1 J·mol –1 ) which is in good agreement with structural results.…”

Section: Resultssupporting

confidence: 74%

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Single Crystal X-ray Diffraction Studies of Two Polymorphic Modifications of the Dicarbonyl-o-Semiquinonato Rhodium Complex at Different Temperatures. Destruction Stimulated by Cooling Versus Stability

et al. 2020

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It was found that the dicarbonyl-rhodium- o -semiquinonate complex (which thread-like crystals can bend reversibly under light/warm activation) can form two polymorphic modifications: isometric prisms ( 1 ) and sticks ( 2 ). Some thin sticks can bend as mentioned above. X-ray diffraction studies of polymorphic modifications at different temperatures were carried out. It was found that crystals 1 are destructed after cooling to 110 K as opposed to crystals 2 . In turn, the reversible phase transition is detected in 2 . In both polymorphic modifications, stack packaging motifs through the direct Rh–Rh bond are observed. The principal difference between packages of polymorphic modifications is that molecules 1 in the adjacent stacks are shifted relative to each other along the stack, in contrast to crystal 2 . It was found that different packing of stacks leads to different anisotropic compression of crystals 1 and 2 during cooling, which is a key factor of their stability. Using the molecular invariom approach, the nature of the chemical bonds and charge distribution was investigated; the energy of the Rh–Rh bonds was estimated.

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Section: Resultssupporting

confidence: 79%

Section: Resultssupporting

confidence: 74%

Single Crystal X-ray Diffraction Studies of Two Polymorphic Modifications of the Dicarbonyl-o-Semiquinonato Rhodium Complex at Different Temperatures. Destruction Stimulated by Cooling Versus Stability

et al. 2020

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“…Thin tetragonal plates of a hexane solvate of a mixed squarate/catecholate (3,6-DBCat) complex [Co III (μ-pyrazine)(3,6-DBSQ)(3,6-DBCat)] n ( 34b , Scheme ) form linear chains of pyrazine-bridged mixed-charge units that curl upon excitation with a tungsten lamp at low temperature . The effect is due to an anisotropic change in the length of the stacking axis on the irradiated side of the crystal due to the valence tautomerism induced by excitation in the 2500 nm band. , Although the effect is weaker relative to that observed with Rh(3,6-DBSQ)(CO) 2 , it demonstrates that the photoinduced bending is a more general phenomenon and could be expected in cases where there is a significant anisotropic change along different directions in nonuniformly irradiated thin crystals.…”

Section: Overview Of Experimentally Observed Mechanical Effects In Cr...mentioning

confidence: 99%

Mechanically Responsive Molecular Crystals

et al. 2015

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“…Since then, molecular systems that exhibit bista bility-the ability to exist in two different electronic states and change their electronic state upon the effect of external actions-have attracted especial attention of researchers. The continuing interest in processes of reversible intramolecular electron transfer exists because these processes appear promising as a basis for develop ment of molecular sensors and nanosized devices for recording and storage of information [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42].…”

Section: Inter and Intramolecularmentioning

confidence: 99%