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Ethylenediamine and 1,10-phenanthroline biscyclometallated complexes of Pd(II) and Pt(II) based on 4,6-diphenylpyrimidine

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Abstract

Biscyclometallated [(M(N∧N))2(μ-dphpm)](ClO4)2 and [(N∧N)Pd(μ-dphpm)Pt(N∧N)]Cl2 complexes [M = Pd(II), Pt(II); (N∧N) ethylenediamine (En), 1,10-phenanthroline (phen); dphpm2 — bisdeprotonated form of 4,6-diphenylpyrimidine)] have been characterized by the 1H NMR, electronic absorption and emission spectroscopy, and also cyclic voltammetry methods. The lowest unoccupied molecular orbital (LUMO) of biscyclometallated complexes with ethylenediamine, responsible for low-energy photo- and electro-stimulated processes irrespective of the metal nature, is assigned to the π* orbital mainly localized on the pyrimidine part of the bridging ligand. In the case of complexes with phenanthroline chelating ligands, the replacement of one or two palladium metal centers [{Pd(phen)}2(μ-dphpm)]2+ by platinum centers changes the LUMO nature of the complexes for the π* orbital mainly localized on the peripheral metal-complex fragment {Pt(phen)}.

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Authors and Affiliations

  1. Hertzen Russian State Pedagogical University, nab. r. Moiki 48, St. Petersburg, 191186, Russia

    E. V. Ivanova, M. V. Puzyk & K. P. Balashev

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  1. E. V. Ivanova
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  2. M. V. Puzyk
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  3. K. P. Balashev
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Correspondence to K. P. Balashev.

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Original Russian Text © E.V. Ivanova, M.V. Puzyk, K.P. Balashev, 2009, published in Zhurnal Obshchei Khimii, 2009, Vol. 79, No. 10, pp. 1600–1606.

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Ivanova, E.V., Puzyk, M.V. & Balashev, K.P. Ethylenediamine and 1,10-phenanthroline biscyclometallated complexes of Pd(II) and Pt(II) based on 4,6-diphenylpyrimidine. Russ J Gen Chem 79, 2096–2101 (2009). https://doi.org/10.1134/S107036320910003X

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  • DOI: https://doi.org/10.1134/S107036320910003X

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