Metal complexes of macrocyclic ligands containing pyridine

Costa, Judite; Delgado, Rita

doi:10.1021/ic00075a052

Cited by 100 publications

(102 citation statements)

References 7 publications

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“…The spectra of Cu-1ϪCu-3, Cu-5, and Cu-6 all consist of a single, broad line with apparent g values as given in Table 5. The spectral resolution could not be improved by tenfold dilution and lower microwave power and modulation settings, in agreement with observations by Costa and Delgado [8] who noted for Cu-1 and related complexes the loss of resolution in solutions of low ionic strength (Table 5, footnote [b] ). The anisotropic parameters (Table 5) were evaluated by spectral simulation and are approximate values because of the low resolution.…”

Section: Electron Paramagnetic Resonancesupporting

confidence: 90%

Studies of Pyridinyl‐Containing 14‐Membered Macrocyclic Copper(II) Complexes

et al. 2003

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Six copper(II) complexes of tetracoordinating, pyridinyl-containing 14-membered macrocycles with varying ratios of nitrogen and oxygen donor atoms were prepared and characterized by IR, UV/Vis, and EPR spectroscopy and cyclic voltammetry. A distorted tetragonal coordination of the copper center in the solid-state was established by X-ray crystallography for the tetraazamacrocyclic complex Cu-3 carrying a methoxybenzyl pendent arm and the trioxaaza complex Cu-6. The superoxide dismutase-like activity of the Cu II complexes was investigated by inhibition of NADH oxidation. Al-

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Section: Electron Paramagnetic Resonancesupporting

confidence: 90%

Studies of Pyridinyl‐Containing 14‐Membered Macrocyclic Copper(II) Complexes

et al. 2003

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“…8,9,12 All reagents and chemicals were obtained from commercial sources and used as received. Solvents used for the chemical synthesis were of analytical grade and used without further purification.…”

Section: Methodsmentioning

confidence: 99%

“…[1][2][3][4][5][6][7] Here, we communicate some initial results on coordination chemistry of Pt(II) with different azapyridinacyclophanes (see Chart 1), These triaza macrocycles, have been shown to display interesting properties in their coordination to metal ions. 8,9 .…”

Section: Introductionmentioning

confidence: 99%

<strong>Synthesis and Platinum (II) Complexes of Different Polyazacyclophane Receptors</strong>

Verdejo

Pitarch‐Jarque

Delgado‐Pinar

et al. 2015

Proceedings of MOL2NET, International Conference on Multidisciplinary Sciences

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Abstract:The interaction of PtCI4 2-with different polyazacyclophanes containing a pyridine unit as aromatic spacer has been studied by 1 H and 195 Pt NMR spectroscopy, Analysis of the recorded spectra of D2O solutions containing L and PtCl4 2-in a 1:1 molar ratio at acidic pH shows the evolution with time of the 1 H and 195 Pt signals. Different crystal structures have been solved by X-ray diffraction analysis. At acidic pHs, the metal ion is coordinated by the central amino group of the macrocyclic cavity and three chloride or bromide atoms, in a square planar geometry. Formation of [Pt(H2L1)Br3]Br (1) and [Pt(H2L2)Br3]Br (2) reveals the rapid substitution of chloride ligands in PtCl4 2-by bromide ligands. However, as reveals the crystal structure obtained for [Pt IV L3Br2](PtBr4)(H2O) (4), at slightly higher pH values, the metal ion is coordinated through all nitrogen atoms of the macrocyclic cavity and an oxidation to Pt(IV) occurs. .

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“…The most investigated member of this family is heptadentate H 3 PCTA (H 3 PCTA = pyridine-containing cyclen triacetic acid) which is based on pyclene (a pyridine-containing 12-membered macrocycle) and has three acetic acid pendant arms. Pyclene has been synthesized by Richman-Atkins method from tritoslated 1,4,7-triazaheptane and 2,6-bis(bromomethyl)pyridine [338,339]. After cleavage of tosyl groups in the mixture of HBr, AcOH, and phenol, the acetate pendants were introduced by reaction with potassium chloroacetate in aq.…”

Section: H 3 Pcta and Related Ligandsmentioning

confidence: 99%