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Reversible Mechanical Interlocking of D‐Shaped Molecular Karabiners bearing Coordination‐Bond Loaded Gates: Route to Self‐Assembled [2]Catenanes
Author(s) -
Prusty Soumyakanta,
Krishnaswamy Shobhana,
Bandi Sreenivasulu,
Chandrika Baby,
Luo Jingwei,
McIndoe J. Scott,
Hanan Garry S.,
Chand Dillip Kumar
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201502394
Subject(s) - catenane , ethylenediamine , chemistry , stereochemistry , crystallography , yield (engineering) , bipyridine , methylene , crystal structure , molecule , medicinal chemistry , materials science , inorganic chemistry , organic chemistry , metallurgy
Abstract Complexation of 1,4‐phenylenebis(methylene) diisonicotinate, L1 , with cis ‐protected Pd II components, [Pd( L′ )(NO 3 ) 2 ], in an equimolar ratio yielded binuclear complexes, 1 a – d of [Pd 2 ( L′ ) 2 ( L1 ) 2 ](NO 3 ) 4 formulation where L′ stands for ethylenediamine (en), tetramethylethylenediamine (tmeda), 2,2′‐bipyridine (bpy), and phenanthroline (phen). The combination of 4,4′‐bipyridine, L2 , with the cis ‐protected Pd II units is known to yield molecular squares, 2 a – d . However, 2 b – d coexist with the corresponding molecular triangles, 3 b – d . Combination of an equivalent each of the ligands L1 and L2 with two equivalents of cis ‐protected Pd II components in DMSO resulted in the D ‐shaped heteroligated complexes [Pd 2 ( L′ ) 2 ( L1 )( L2 )](NO 3 ) 4 , 4 a – d . Two units of the D ‐shaped complexes interlock, in a concentration dependent fashion, to form the corresponding [2]catenanes [Pd 2 ( L′ ) 2 ( L1 )( L2 )] 2 (NO 3 ) 8 , 5 a – d under aqueous conditions. Crystal structures of the macrocycle [Pd 2 (tmeda) 2 ( L1 )( L2 )](PF 6 ) 4 , 4 b′′ , and the catenane [Pd 2 (bpy) 2 ( L1 )( L2 )] 2 (NO 3 ) 8 , 5 c , provide unequivocal support for the proposed molecular architectures.

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