Single crystal electron paramagnetic resonance spectra of CuII ions in Cu(tyrosine)2

Structural, spectroscopic and magnetic properties of a novel copper(ii)l-tyrosinato complex

“…The coordination sphere may be extended to six-coordinated, taking into account the intramolecular cation-p interaction between the aromatic ring of the coordinated L-Tyr ligand and copper atom (Cu 2+ /p distance equals 3.483(4) A). Similar conguration of intramolecular stacking with distances 3.49 A was found in [Cu(L-Tyr) 2 ] n [20][21][22] and other L-tyrosinato, L-phenolato or tryptophano Pd(II) and Cu(II) ions complexes, which consist of a characteristically bent aromatic ring. [20][21][22][26][27][28][29][30][31]38,53 18,20-22,53i The distance from Cu(II) to apical O(1) water oxygen is longer 2.347(4) A but within the range of 2.2-2.9 A known for the axial Cu-O bond lengths.…”

“…Similar conguration of intramolecular stacking with distances 3.49 A was found in [Cu(L-Tyr) 2 ] n [20][21][22] and other L-tyrosinato, L-phenolato or tryptophano Pd(II) and Cu(II) ions complexes, which consist of a characteristically bent aromatic ring. [20][21][22][26][27][28][29][30][31]38,53 18,20-22,53i The distance from Cu(II) to apical O(1) water oxygen is longer 2.347(4) A but within the range of 2.2-2.9 A known for the axial Cu-O bond lengths. 54 The angular parameter of the degree of trigonality dened as s ¼ (b À a)/60; 55 where a 4(2) deg.…”

“…19 Aer that researchers drew attention to polymeric structure and expected magnetic properties of the bis-(L-tyrosinato)copper(II) complex, 18 nally, they described it as a coordination polymer of formula [Cu(L-Tyr) 2 ] n . [20][21][22] In recent years, a narrow group of L-tyrosinato ve-coordinated Cu(II) ion complexes has been extended by four new complexes consisting of aromatic diamine and water molecule located in vertices of a square-pyramid, characterized by crystal structure, spectroscopic and magnetic studies: [Cu(L-Tyr)(2,2 0 -bpy)(H 2 O)]Cl$3H 2 O (2,2 0 -bpy ¼ 2,2 0 -bipyridine), 23 [Cu(L-Tyr)(phen)(H 2 O)]ClO 4 $2.5H 2 O, 24 [Cu(L-Tyr)(phen)(H 2 O)]ClO 4 25 and [Cu(phen)(L-Tyr)(EA)]ClO 4 (phen ¼ 1,10-phenanthroline, EA ¼ ethylamine), [Cu(L-Tyr)(5,6dmp)(H 2 O)]ClO 4 (5,6-dmp ¼ 5,6-dimethyl-1,10-phenanthroline), 27 [Cu(IP)(L-Tyr)(H 2 O)]ClO 4 $H 2 O (IP ¼ imidazol [4,5-f][1,10] phenanthroline). 28 Especially, the [Cu(L-Tyr)(5,6-dmp)(H 2 O)]ClO 4 complex is worth to mention, because of the studies of DNA cleavage and anticancer activity of this complex revealed its interaction with DNA of a calf thymic lymphocytes leading to the mitotic catastrophe and apoptotic cell death.…”

Metal complexes of amino acids and peptides

“…1 Crystal EPR measurements for [Cu (Tyr) 2 ] N , with the purpose of characterizing the weak magnetic exchange interactions have been performed. The Cd(II) complexes have shown good zone inhibition towards different microorganisms, but the Hg(II)-containing ones not.…”

“…3 Several papers have been published with results obtained on chiral coordination compounds and chiral recognition. The octahedral Pt(IV) complex trans,trans,trans-[Pt(N 3 ) 2 (OH) 2 (pyridine) 2 ] is cytotoxic to cancer cells when irradiated with visible (blue) light. 4 Two pairs of new in situ-generated chiral amino acid-tetrazole ligands were prepared and they were used to construct two pairs of Interestingly, chiral centres have been generated in a disproportionation reaction, in which the achiral Au(I)-and Ni(II)-containing mixed metal complex of D-penicillaminate has been converted into two kinds of chiral, octahedral Ni(II) centers on treatment of the original achiral complex with an achiral diimine ligand.…”