Novel tumor chemotherapeutic agents and tumor radio-imaging agents: Potential tumor pharmaceuticals of ternary copper(II) complexes
摘要:
Potential tumor chemotherapeutic agents and tumor radio-imaging agents of -Cu2+-salicylidene-amino acid Schiff bases-Phen (Bipy) ternary complexes have been designed and synthesized, their antitumor activity and tumor imaging of Cu-64 labeled ones have been tested in tumor-bearing mice. (c) 2005 Elsevier B.V. All rights reserved.
Thermodynamic stereoselectivity assisted by weak interactions in metal complexes. Chiral recognition of L/D-amino acids by the copper(II) complex of 6-deoxy-6-[4-(2-aminoethyl)imidazolyl]cyclomaltoheptaose
作者:Raffaele P. Bonomo、Vincenzo Cucinotta、Giuseppe Maccarrone、Enrico Rizzarelli、Graziella Vecchio
DOI:10.1039/b100443n
日期:——
Potentiometric and spectroscopic methods were used to investigate the stability and bonding details of the copper(II) complexes of β-cyclodextrin (β-CD) functionalized by histamine through the imidazole N-1 (CDmh) and a number of enantiomeric pairs of amino acidates (AaO−) where AaO− is alaninate (AlaO−), phenylalaninate (PheO−) or tryptophanate (TrpO−). Stability constant values were determined at 25 °C and I = 0.1 mol dm−3 (KNO3). Enantioselectivity was observed in the copper(II) mixed complex formation of L/D-TrpO− in aqueous solution and [Cu(CDmh)(L-TrpO)]+ was seen as being favoured over [Cu(CDmh)(D-TrpO)]+. In contrast, the AlaO− systems did not show any differences in the stability of copper(II) diastereomeric ternary complexes. The c.d. spectra of the complexes containing aromatic L-amino acids showed much higher intensity (Δε) compared with the spectra for the corresponding D-amino acids, the difference Δ(Δε) increasing in proportion to the size of the side chain. Subtle differences were found to exist between the ESR parameters of the diastereomeric complexes with TrpO−. However, these tended to disappear upon the addition of a less polar solvent. The results obtained are consistent with a model where the complexation of the L enantiomer to copper already bound to the histamine residue is favoured by the inclusion of the aromatic side chain in the cyclodextrin cavity, this in turn being due to the preferential cis arrangement of the amino nitrogens in the two ligands.
CuO nanoleaves with a mesoporous structure have been synthesized in the presence of triethylamine at room temperature. The mesoporous CuO nanoleaves exhibit excellent catalytic activity for solvent-free cyclohexene oxidation with oxygen.
UV-Vis and EPR spectroscopic study of copper(II) complexes with bis(benzimidazol-2-yl) ligands
作者:Raffaele P. Bonomo、Enrico Rizzarelli、Mario Bressan、Antonio Morvillo
DOI:10.1016/s0020-1693(00)87925-6
日期:1991.8
Abstract Copper(II) complexes with bis(benzimidazol-2-yl) ligands of the type Bz(CH 2 ) n -X-(CH 2 ) n Bz (where Bz=benzimidazol-2-yl; XO, S or CH 2 ; n =1, 2) have been characterized in solution by UV-Vis and EPR spectroscopy. Mono complexes with O or S donor atom containing ligands have square-pyramidalstereochemistries, while biscomplexes have pseudo-octahedral geometries with four nitrogen donors
Unusual Noncovalent Interaction Between the Chelated Cu(II) Ion and the π Bond in the Vitamin B<sub>13</sub> Complex, <i>cis</i>-Diammine(orotato)copper(II): Theoretical and Vibrational Spectroscopy Studies
作者:K. Helios、R. Wysokiński、W. Zierkiewicz、L. M. Proniewicz、D. Michalska
DOI:10.1021/jp901912v
日期:2009.6.11
chelated Cu(II) complex and ethylene amounts to −7.33 kcal mol−1, which is similar to that determined for stacked uracil dimer. It is concluded that the London dispersion energy plays a significant role in the noncovalent interaction between the chelated Cu(II) ion and the uracilate ring in the crystal of cis-[Cu(oro)(NH3)2]. Many copper enzymes in their active sites contain the chelated Cu(II) ion and
具有维生素B 13(乳清酸),顺式[[Cu(oro)(NH 3)2 ]的Cu(II)配合物的晶体结构表明,螯合的Cu(II)之间存在异常的,非共价的π型相互作用离子和尿嘧啶环的C═C键[Michalska et al。多面体2007,26,4303]。在这项工作中,这种相互作用的起源和强度得到了彻底的研究。使用不受限制的密度泛函理论方法,B3LYP和新开发的M05-2X泛函,对标题复合物的分子结构和振动光谱进行了全面的研究。为了比较,还进行了UMP2级别的计算。DFT计算中已经采用了多种基础集,包括aug-cc-pVTZ,D95V(d,p),SDD和LanL2DZ。的63铜/ 65铜同位素替代技术用于识别红外光谱中的铜配体振动。在计算出的势能分布PED的基础上,对标题配合物的FT-IR和拉曼光谱中的所有波段进行了明确分配。结果表明,顺式-[Cu(oro)(NH 3)2 ]的拉曼光谱中1210
Nitrogen oxide interaction with copper complexes formed by small peptides belonging to the prion protein octa-repeat region
作者:Raffaele P. Bonomo、Giuseppe Pappalardo、Enrico Rizzarelli、Anna M. Santoro、Giovanni Tabb?、Laura I. Vagliasindi
DOI:10.1039/b617408f
日期:——
The interaction between NO and copper(II) complexes formed by peptides coming from the N-terminal prion protein octa-repeat region was studied. Aqueous solutions of the Cu-Ac-HGGG-NH2 and the Cu-Ac-PHGGGWGQ-NH2 systems around pH 7.5 were tested after the addition of NONOates as a source of NO. UV-Vis, room temperature and frozen solution EPR spectra showed the occurrence of copper(II) reduction in all these complexes. The reduction of these complexes is probably mediated by the formation of a labile NO adduct, which, after re-oxidation, leads to a relatively stable NO2− adduct through the apical coordination along the void site of their square pyramidal structure. In fact, the most significant shifts in EPR magnetic parameters (g‖ and A‖ or giso and Aiso) as well as in the optical parameters (λmax and εmax) gave a reason for geometrical changes of the copper coordination polyhedron from a distorted square pyramid to a pseudo-octahedron. The presence of oxygen in the aqueous solution hindered the reduction ability of NO towards copper, but it made it easier to return to the original species. In order to elucidate the possible mechanism of this interaction, the reduction of copper complexed by these ligands was followed by means of zinc powder addition. The further addition of nitrite to the solution containing reduced copper led to the conclusion that nitrite could easily form an adduct, which after re-oxidation presented the same spectral features of the species obtained when the NO interaction was followed. The complexity of this interaction could involve both an inner or an outer-sphere electron transfer mechanism.