499-40-1, Name is (2R,3S,4R,5R)-2,3,4,5-Tetrahydroxy-6-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexanal, molecular formula is C12H22O11, belongs to Tetrahydropyrans compound, is a common compound. In a patnet, once mentioned the new application about 499-40-1, 499-40-1
High spin ground state copper(II) and nickel(II) complexes possessing the 3,5-di-tert-butyl-1,2-semiquinonate radical anion
Several high spin ground-state compounds based upon ferromagnetic coupling between a metal ion and the chelating 3,5-di-tert-butyl-1,2-semiquinonate radical anion, [DTBSQ][rad]?, as they possess unpaired electron spins in orthogonal dx2?y2/dz2 and pi? orbitals, are described. [CuII(DPyA)(DTBSQ)](ClO4) (DPyA?=?2,2?-dipyridylamine) was reinvestigated and its singlet excited state is 282?cm?1 [0.035?eV; J/kB?=?406?K (H?=??JSa¡¤Sb)] above the triplet ground state. [CuII(bipy)(DBCat)(MeOH)] (bipy?=?2,2-bipyridine; DBCat?=?3,5-di-tert-butylcatecholate), [CuII(bipy)(DTBSQ)](BF4), [CuII(DPyA)(DTBSQ)-(THF)2](BF4) and [NiII(DPyA)(DTBSQ)(THF)2](BF4) have been structurally characterized and have high spin ground states whose low spin excited states lie 28?cm?1 (0.0034?eV), 382?cm?1 (0.047?eV), 335?cm?1 (0.042?eV), and 108?cm?1 (0.013?eV) higher, respectively. The triplet-singlet separation is 18% greater for [CuII(DPyA)(DTBSQ)(THF)2]+ than [CuII(DPyA)(DTBSQ)]+ and is ascribed to greater orthogonality of the CuII dx2?y2/dz2 and [DTBSQ][rad]? pi? orbitals for octahedral [Cu(DPyA)(DTBSQ)(THF)2]+ with respect to distorted square pyramidal structure of [Cu(DPyA)(DTBSQ)]+. This greater energy of the excited state correlates with the shorter than average M-ODTBSQ distance, i.e. [Cu(bipy)(DTBSQ)]+?>?[CuII(DPyA)(DTBSQ)(THF)2]+?>?[Ni(DPyA)(DTBSQ)(THF)2]+. The order of magnitude lower value for [CuII(bipy)(DBCat)(MeOH)] arises from a weak intradimer S?=?1/2 Cu(II) interaction, not via ferromagnetic coupling between the S?=?1/2 Cu(II) and [DTBSQ][rad]? sites.
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Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics