Journal
RUSSIAN JOURNAL OF COORDINATION CHEMISTRY
Volume 35, Issue 2, Pages 128-135Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S1070328409020079
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The diamagnetic complexes [Pd-2(H2L1)Cl-4] (I), [Pd-2(H2L2)Cl-4] (II), and Pd-2(H2L3)Cl-4(III) with chiral ligands derived from the natural monoterpenoid (R)-(+)-limonene are obtained (H-2 L-1 is ethylenediamine dioxime, H2L2 is piperazine dioxime, and H2L3 is propylenediamine dioxime). According to X-ray diffraction data, the crystal structures of complexes I and II are composed of binuclear acentric molecules. The coordination polyhedra PdN2Cl2 are trapeziums (squares distorted in a tetrahedral manner) made up of two N atoms of the tetradentate bridging cyclic ligands H2L1 and H2L2 and two Cl atoms. The fragments PdCl2 are trans in the complexes. The C-13 and H-1 NMR spectra of complexes I and II in CDCl3 also suggest their binuclear structures.
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