3248-05-3Relevant articles and documents
Carbon-hydrogen bond breaking and making in the open-shell singlet molecule Cp2Yb(4,7-Me2phen)
Nocton, Grgory,Booth, Corwin H.,Maron, Laurent,Ricard, Louis,Andersen, Richard A.
, p. 6819 - 6829 (2014)
The adducts formed between the 4,7-Me2-, 3,4,7,8-Me4-, and 3,4,5,6,7,8-Me6-phenanthroline ligands and Cp2Yb are shown to have open-shell singlet ground states by magnetic susceptibility and LIII-edge XANES spectroscopy. Variable-temperature XANES data show that two singlet states are occupied in each adduct that are fit to a Boltzmann distribution for which δH = 5.75 kJ mol-1 for the 4,7-Me2phen adduct. The results of a CASSCF calculation for the 4,7-Me2phen adduct indicates that three open-shell singlet states, SS1-SS3, lie 0.44, 0.06. and 0.02 eV, respectively, below the triplet state. These results are in dramatic contrast to those acquired for the phenanthroline and 5,6-Me2phen adducts, which are ground state triplets (J. Am. Chem. Soc. 2014, 136, 8626). A model that accounts for these differences is traced to the relative energies of the LUMO and LUMO+1 orbitals that depend on the position the methyl group occupies in the phenanthroline ligand. The model also accounts for the difference in reactivities of Cp2Yb(3,8-Me2phen) and Cp2Yb(4,7-Me2phen); the former forms a σ C-C bond between C(4)C(4′), and the latter undergoes C-H bond cleavage at the methyl group on C(4) and leads to two products that cocrystallize: Cp2Yb(4-(CH2),7-Mephen), which has lost a hydrogen atom, and Cp2Yb(4,7-Me2-4H-phen), which has gained a hydrogen atom.
Color responses of novel receptors for AcO- and a test paper for AcO- in pure aqueous solution
Yu, Xudong,Lin, Hai,Cai, Zunsheng,Lin, Huakuan
, p. 8615 - 8618 (2008/03/30)
An efficient AcO- sensor L which contains 1,10-phenanthroline-based and nitrophenylhydrazine-based groups, and its water-soluble Ru(II) complex were synthesized, characterized and studied in this Letter. Via UV-vis experiments and 1H NMR titration in DMSO solution, it was found that there were potential hydrogen bonds between the N{double bond, long}CH and AcO- after the deprotanation of two -NH during the reaction of L or its Ru complex with anions. Furthermore, an easy-to-prepare test paper was developed to detect AcO- at 10 mg/L in pure aqueous solution.
Thermodynamic studies of the binding of bidentate nitrogen donors with methyltrioxorhenium (MTO) in CHCl3 solution
Nabavizadeh, S. Masoud
, p. 1644 - 1648 (2007/10/03)
Methyltrioxorhenium (MTO) adduct formation with bidentate nitrogen donors 2,2′-bipyridine (bpy), 4,4′-dimethyl-2,2′-bipyridine (Me 2bpy), 4,4′-di-tert-butyl-2,2′-bipyridine ( tBu2bpy), 1,10-phenanthroline (phen), 5-methyl-
Production method of a cross-coupling compound from an alkyl halide and an organoboron compound
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, (2008/06/13)
There is provided a method for producing a coupling compound of formula (1):(Y-)(n-1)R1-R2-(R1)(n'-1) wherein R1, R2 n and n' are as defined below, Y is R2 or X as defined below, which method comprises reactinganorganichalogen compound of formula (2):n' (R1X1n) wherein X1 represents a bromine or iodine, R1 represents a substituted or unsubstituted, linear, branched or cyclic hydrocarbon group of which α and β carbon atoms in relation to X1 are sp3 carbon atoms, n and n' each independently represent an integer of 1 or 2, and provided that n and n' do not simultaneously represent 2, with an organic boron compound of formula (3):m{R2(BX22)n'} wherein R2 represents a substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl or substituted or unsubstituted alkenyl group and the boron atom is bonded with an sp2 carbon atom thereof, X2 represents a hydroxyl or alkoxy group, n' is as defined above, m represents an integer of 1 or 2, and m is not more than n, in the presence of a catalyst comprising a) a nickel compound, and ???b) b-1) a compound of formula (i): ???or ???b-2) a compound of formula (ii):
Catalyst compositions and a process for polymerizing carbon monoxide and olefins
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, (2008/06/13)
Carbon monoxide and at least one olefinically unsaturated organic compound may be polymerized by contacting the monomers in the presence of a catalyst which comprises a Group VIII metal compound of palladium, cobalt or nickel, a halide of tin or germanium, a nitrogen bidentate ligand and an organic oxidant. The polymers prepared are linear alternating polymers which consist of units with the formula STR1 where A is the residue of an alkenically unsaturated organic compound monomer.
A Simple Synthesis of Some 1,10-Phenanthrolines
Butt, Graeme,Topsom, Ronald D.
, p. 641 - 642 (2007/10/02)
The reaction of o-phenylenediamine with α,β-unsaturated ketones in the presence of hydrochloric acid smoothly affords alkyl substituted 1,10-phenanthrolines in a one step synthesis.