An article , which mentions 499-40-1, molecular formula is C12H22O11.499-40-1, The compound – (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 played an important role in people’s production and life.
Synthesis and mixed valence aspects of [{(L)ClRu} 2(mu-tppz)]n+ incorporating 2, 2?-dipyridylamine (L) as ancillary and 2,3,5,6-tetrakis(2-pyridyl)pyrazine (tppz) as bridging ligand
The tppz-bridged diruthenium complex [{(L)ClRuII} 2(mu-tppz)](ClO4)2, [1](ClO4) 2 {tppz = 2,3,5,6-tetrakis(2-pyridyl)pyrazine, L = 2,2?-dipyridylamine} and its mononuclear counterpart [(L)ClRu II(tppz)]ClO4, [2](ClO4) have been synthesized. The 380 mV separation between successive RuII/RuIII couples in [1]2+ leads to a comproportionation constant (K c) of 2.7 ¡Á 106. Consequently, the Ru IIRuIII species [1]3+ exhibits a rather narrow intervalence charge transfer band at 1700 nm, suggesting a class III mixed-valence state, the electronic coupling constant (Vab) is calculated at 2940 cm-1. Complex [1]3+ displays a rhombic EPR spectrum at 4 K (g1 = 3.390, g2 = 2.278, g 3 = 1.697), characteristic of ruthenium(III) in a distorted octahedral environment. Both complexes show two successive tppz-based reduction processes [(tppz)0/-1 and (tppz)-1/-2]. The one-electron reduced species [1]+ is a tppz radical anion species with an intense low-energy band at 1105 nm and an axial EPR signal at 4 K (g1 = 2.008, g2 = g3 = 1.994). [1]2+ and [2] + exhibit moderately strong emissions at 740 nm and 668 nm, respectively, in EtOH-MeOH glass at 77 K.
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Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics