Valence Tautomeric Transitions of Three One-Dimensional Cobalt Complexes
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https://figshare.com/articles/dataset/Valence_Tautomeric_Transitions_of_Three_One_Dimensional_Cobalt_Complexes/2225572
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资源简介：
Three novel complexes, namely, [CoIII(3,5-DBCat)(3,5-DBSq)(bpe)]·2CH3CN·2H2O (1·S), [CoIII(3,5-DBCat)(3,5-DBSq)(azpy)]·2CH3CN·2H2O (2·S), and [CoII(3,5-DBSq)2(bpb)][CoIII(3,5-DBCat)(3,5-DBSq)(bpb)]0.5·2CH3CN·2H2O (3·S), were synthesized and characterized by
valence tautomeric (VT) X-ray diffraction and magnetic measurements
[where 3,5-DBCatH2 = 3,5-di-tert-butyl-catechol,
3,5-DBSqH = 3,5-di-tert-butyl-semiquinone, bpe = trans-bis(4-pyridyl)ethylene, azpy = trans-4,4′-azopyridine, and bpb = 1,4-bis(4-pyridyl)benzene]. The
three complexes have similar one-dimensional chain structure building
from bidentate-bridging pyridine ligands and planar 3,5-DBCat/3,5-DBSq-fixed
CoII/III entities. Complexes 1·S and 2·S could retain
the crystallinity during desolvation, and the crystal structures of 1 and 2 were therefore able to be determined.
Only when 1·S and 2·S desolvated above 310 K did the magnetic susceptibilities × temperatures values of the two complexes
rise sharply, and then thermally induced complete, one-step VT transitions
for 1 and 2 were available and repeatable.
Complex 3·S showed an incomplete,
one-step VT transition independent of solvent molecules. Among these
complexes, only 1 was sensitive to photoexcitation at
low temperature, its photoinduced metastable state relaxed with temperature-independent
behavior at low temperature range (5–10 K) and with thermally
assisted behavior at high temperature range (above 20 K), respectively.
创建时间：
2014-12-15
