Synthesis, characterization and spectra of lanthanide(III) hydrazone complexes

Charge Transfer and f-f Transitions Studied by Photoacoustic Spectroscopy of [R(NO3)2(PicBH)2]NO3and [R(NO3)3(PicBH)2] Complexes (R - Rare Earth Ion)

“…The erbi um ato m i s 10-coordi nate by l i nki ng to tw o tri denta te 2-pyri di necarb oxa ldehyde benzoyl hydrazone l igands and two bi denta te ni tra te li gands. The Er{ O di sta nces ra nge between 2.361(3 ) ¡ A and 2.46 5(3) ¡ A. Si mi l arl y the Er{ N di sta nces ra nge b etween 2.535(3 ) ¡ A and 2.60 3(3) ¡ A [13]. The l i nki ng of the hydra zone (Hdr) li gand to the m etal a tom i s accompl i shed thro ugh the pyri di ne ni tro gen, the azom ethi ne ni tro gen and the carb onyl oxyg en i n al l compl exes.…”

“…The tri ni tra to -bi s[N-(2-pyri dylm ethylene)-N 0 -b enzoyl -hydra zine]R(I I I), (R = La , Ce, Pr), and bi ni tra to -bi s[N-(2-pyri dylm ethy lene)-N 0 -b enzoyl -hydra zine] R(I I I) ni tra te (R = Y, Nd, Eu, Yb, Tb, G d, Ho, D y, Er) compl exes were prepa red under anhydro us condi ti ons by the di rect reacti on of a sol uti on of the l i gand 2-pyri di necarb oxa ldeh yde b enzoyl hydra zine (Pi cBH) wi th a sol uti on of the l antha ni de sal t as describ ed previ ously [13]. Al l synthesi zed com pl exes were crysta l l i ne sol i ds, stabl e in dry ai r for at l east one year.…”

Synthesis and Crystal Structure of the Binuclear Complex [Pr2(C10H8N2O4)2(C10H9N2O4)2(H2O)4]·3H2O·C6H6

“…Pyruvic acid was biochemical reagent, Pr(NO 3 ) 3 • 6H 2 O was prepared by dissolving 99.95% Pr 2 O 3 in HNO 3 and water [V(HNO 3 )∶V(water)＝1∶1], and all other chemicals were of AR grade. The C, H and N analyses were taken with a Perkin Elmer model 2400 elemental analyzer, while the X-ray data for the crystal were collected on a Bruker Smart-1000 CCD X-ray single crystal diffractometer.…”

“…1 Acyl hydrazone ligands bearing both nitrogen and oxygen donors to exhibit both hard and soft base character would form more stable complexes than the polyoxa or polyaza ligands of these kinds with lanthanide(III) cations. 2 For the complexes of acyl hydrazone, there are three coordination forms reported by researches: keto form, enolic form and dehydrogenation conjugation form, [3][4][5] where the valence existence of acyl hydrazone is multiple. [6][7][8][9] To our knowledge, no paper concerning crystal structure of biunclear lanthanide(III) complexes with N-(1-carboxyethylidene)-salicylhydrazide has been reported.…”

Crystal Structure and Bioactivity of Complex [Gd(C10H9N2O4)(C10H8N2O4)(H2O) 3]2·phen·4H2O

“…For the complexes of acyl hydrazone with rare earth elements, there are three coordination forms reported by researches: keto-form, enolic form and dehydrogenation coujugation form. [1][2][3] The valence existence of acyl hydrazone is multiple. [4][5][6][7] Acyl hydrazones have been found to be potent inhibitors of DNA synthesis and cell growth in human and rodent cell lines grown in culture.…”