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Issue 21, 2018
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Coordination-driven self-assembly of chiral palladium(II)-based supramolecular triangle structures

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In the present work, four chiral supramolecular coordination complexes (SCCs) are described. The self-assembly of ditopic bis(4R-1H-imidazolyl)benzene ligands (LR, with R = H or Me) and achiral palladium(II) complexes [((en)Pd(NO3)2)] (1a) afford supramolecular coordination complexes 2 and 4 (where en = ethylenediamine). Similarly, self-assembly of LH and achiral [((tmeda)Pd(NO3)2)] (1b) or chiral enantiopure [(((R,R)-Me4-dach)Pd(NO3)2)] (1c) yield compounds 3 and 5 respectively (where tmeda = (N,N,N′,N′)-tetramethylethylenediamine and (R,R)-Me4-dach = (R,R)-(N,N,N′,N′)-tetramethylcyclohexane-1,2-diamine). SCCs 2–5 are fully characterized in solution by 1H (1-D and 2-D experiments), 13C, DOSY NMR spectroscopy, coldspray ionization mass spectrometry. These analyses clearly demonstrate an equilibrium in solution between the triangular (2a–5a) and square (2b–5b) structures, albeit as minor components. The palladium(II) corners of 2a–5a exhibit planar chirality and are homochiral. The solution structures are rare examples of homochiral square planar palladium(II) supramolecular coordination complexes.

Graphical abstract: Coordination-driven self-assembly of chiral palladium(ii)-based supramolecular triangle structures

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Publication details

The article was received on 06 Jun 2018, accepted on 27 Sep 2018 and first published on 28 Sep 2018

Article type: Paper
DOI: 10.1039/C8NJ02804D
Citation: New J. Chem., 2018,42, 17412-17419

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    Coordination-driven self-assembly of chiral palladium(II)-based supramolecular triangle structures

    N. Gimeno, C. Bijani, M. Gouygou and J. Volkman, New J. Chem., 2018, 42, 17412
    DOI: 10.1039/C8NJ02804D

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