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Non-oxidative vanadium-catalyzed co bond cleavage: Application to degradation of lignin model compounds

(Chemical Equation Presented) New direction: Changes In the ligand structure divert the reactivity of vanadium (V) oxo complexes from alcohol oxidation to a novel non-oxidative C-O bond cleavage. Thus, highly functionalized aryl enones can be selectively generated from lignin model compounds by vanadium-catalyzed cleavage of the β-O-4 linkage (see scheme; N blue, O red).

A Schiff base zinc compound, preparation method thereof and method for producing polylactic acid

The invention provides a schiff base zinc compound which is in a structure as shown in Formula 1, wherein R1 and R2 are independently selected from -H, alkyl, halogen and -NO2; R3, R4 and R5 are independently selected from -H and -CH3; R' is alkoxyl or -O

Two tetranuclear copper(II) complexes with open cubane-like Cu 4O4 core framework and ferromagnetic exchange interactions between copper(II) ions: Structure, magnetic properties, and density functional study

Two alkoxo-bridged copper(II) tridentate Schiff base complexes [{Cu(H 2L1)}4] (1) [H2L1 = N-(2-hydroxyethyl)-3,5-di- tert-butylsalicylaldimine] and {Cu(H2L2)}4 (2) [H 2L2 = N-(2-hydroxyethyl)-4-methoxysalicylaldimine] have been synthesized and structurally and magnetically characterized. X-ray diffraction studies show that 1 and 2 are tetranuclear alkoxo-bridged copper(II) complexes that contain a rather distorted Cu4O4 cubane core of 4+2 type (four short and two long Cu?Cu distances). The coordination of each copper ion can be described as a distorted square pyramid with one nitrogen and four oxygen atoms from three ligands. Variable-temperature magnetic susceptibility measurements on the two tetranuclear complexes 1 and 2 in the range 2-300 K indicate ferromagnetic exchange coupling between copper(II) centers. The magnetic susceptibility data were analyzed by using a simple two-J model with J′ and J″ representing the magnetic exchange couplings through the short and long Cu?Cu exchange pathways, respectively. The J values were as follows: J′ = +28.7 cm-1 and J″ = +7.8 cm-1 for 1, and J′ = +39.8 cm-1 and J″ = +10.2 cm-1 for 2. The sign and magnitude of the exchange coupling constants were justified on the basis of the structural geometric factors of the bridging Cu(O)2Cu fragments, the overlap of the magnetic orbitals, and DFT calculations. Two alkoxo-bridged copper(II) tridentate Schiff base complexes were synthesized and structurally and magnetically characterized. Magnetic susceptibility measurements on the tetranuclear complexes indicate ferromagnetic exchange coupling between copper(II) centers. The sign and magnitude of the exchange coupling constants were justified on the basis of several factors including DFT calculations. Copyright

Two tetranuclear copper(II) complexes with open cubane-like Cu4O4 core framework and ferromagnetic exchange interactions between copper(II) ions: Structure, magnetic properties, and density functional study

Two alkoxo-bridged copper(II) tridentate Schiff base complexes [{Cu(H2L1)}4] (1) [H2L1 = N-(2-hydroxyethyl)-3,5-di-tert-butylsalicylaldimine] and {Cu(H2L2)}4 (2) [H2L2 = N-(2-hydroxyethyl)-4-methoxysalicylaldimine] have been synthesized and structurally and magnetically characterized. X-ray diffraction studies show that 1 and 2 are tetranuclear alkoxo-bridged copper(II) complexes that contain a rather distorted Cu4O4 cubane core of 4+2 type (four short and two long Cu?Cu distances). The coordination of each copper ion can be described as a distorted square pyramid with one nitrogen and four oxygen atoms from three ligands. Variable-temperature magnetic susceptibility measurements on the two tetranuclear complexes 1 and 2 in the range 2-300 K indicate ferromagnetic exchange coupling between copper(II) centers. The magnetic susceptibility data were analyzed by using a simple two-J model with J′ and J″ representing the magnetic exchange couplings through the short and long Cu?Cu exchange pathways, respectively. The J values were as follows: J′ = +28.7 cm-1 and J″ = +7.8 cm-1 for 1, and J′ = +39.8 cm-1 and J″ = +10.2 cm-1 for 2. The sign and magnitude of the exchange coupling constants were justified on the basis of the structural geometric factors of the bridging Cu(O)2Cu fragments, the overlap of the magnetic orbitals, and DFT calculations. Two alkoxo-bridged copper(II) tridentate Schiff base complexes were synthesized and structurally and magnetically characterized. Magnetic susceptibility measurements on the tetranuclear complexes indicate ferromagnetic exchange coupling between copper(II) centers. The sign and magnitude of the exchange coupling constants were justified on the basis of several factors including DFT calculations.