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- Title
Octadecanuclear Gear Wheels by Self-Assembly of Self-Assembled 'Double Saddle'-Type Coordination Entities: Molecular 'Rangoli'.
- Authors
Dasary, Hareesha; Jagan, Rajamony; Chand, Dillip Kumar
- Abstract
A series of self-assembled 'double saddle'-type trinuclear complexes of [Pd3L′3 L2] formulation have been synthesized by complexation of a series of cis-protected palladium(II) components with a slightly divergent 'E-shaped' 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)2](NO3)6 ( 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 π surfaces at the strategically located cis-protecting sites to facilitate intermolecular π-π interactions in the solid state. As a consequence, six units of the 3 (or 4) are assembled, by means of six-pairs of π-π stacking interactions, in a circular geometry to form an octadecanuclear molecular ring of [(Pd3L′3 L2)6] composition. The overall arrangement of the rings in the crystal packing is equated with the traditional Indian art form rangoli.
- Subjects
INDIA; PALLADIUM compound synthesis; MOLECULAR self-assembly; INTERMOLECULAR interactions; KOLAM (House marks); HOUSE marks
- Publication
Chemistry - A European Journal, 2015, Vol 21, Issue 4, p1499
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201405255