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Octadecanuclear gear wheels by self-assembly of self-assembled "double saddle"-type coordination entities: Molecular "rangoli"
Hareesha Dasary,
Published in Wiley-VCH Verlag
2015
Volume: 21
   
Issue: 4
Pages: 1499 - 1507
Abstract
A series of self-assembled "double saddle"-type trinuclear complexes of [Pd3L′3L3] formulation have been synthesized by complexation of a series of cis-protected palladium(II) components with a slightly divergent "Eshaped" non-chelating tridentate ligand, 1,1′-(pyridine-3,5-diyl)bis(3-(pyridin-3-yl)urea (L). The cis-protecting agents L′ employed in the study are ethylenediamine (en), tetramethylethylenediamine (tmeda), 2,2′-bipyridine (bpy), and 1,10-phenanthroline (phen), for 1, 2, 3, and 4, respectively. The crystal structures of [Pd3(tmeda)3(L)2](NO3)6 (2), [Pd3(bpy)3(L)3](NO3)3 (3), and [Pd3(phen)3(L)2](NO3 )6 (4) unequivocally support the new architecture. Two of the "double saddle"-type complexes (3 and 4) are suitably crafted with p surfaces at the strategically located cis-protecting sites to facilitate intermolecular p-p interactions in the solid state. As a consequence, six units of the 3 (or 4 ) are assembled, by means of six-pairs of p-p stacking interactions, in a circular geometry to form an octadecanuclear molecular ring of [(Pd3L′3L3)3] composition. The overall arrangement of the rings in the crystal packing is equated with the traditional Indian art form rangoli. © 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
About the journal
JournalData powered by TypesetChemistry - A European Journal
PublisherData powered by TypesetWiley-VCH Verlag
ISSN09476539
Open AccessNo
Concepts (15)
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    Ligands
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    Molecular spectroscopy
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    Palladium
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    Self assembly
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    Synthesis (chemical)
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    Urea
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    1 ,10-phenanthroline
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    ETHYLENEDIAMINE (EN)
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    MOLECULAR RINGS
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    Pi interactions
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    Stacking interaction
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    Tetramethylethylenediamine
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    Tridentate ligands
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    Trinuclear complex
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    Palladium compounds