0000000001316539
AUTHOR
Torsten Piehler
Self-assembly of metallosupramolecular rhombi from chiral concave 9,9'-spirobifluorene-derived bis(pyridine) ligands.
Two new 9,9’-spirobifluorene-based bis(4-pyridines) were synthesised in enantiopure and one also in racemic form. These ligands act as concave templates and form metallosupramolecular [(dppp)2M2L2] rhombi with cis-protected [(dppp)Pd]2+ and [(dppp)Pt]2+ ions. The self-assembly process of the racemic ligand preferably occurs in a narcissistic self-recognising manner. Hence, a mixture of all three possible stereoisomers [(dppp)2M2{(R)-L}2](OTf)4, [(dppp)2M2{(S)-L}2](OTf)4, and [(dppp)2M2{(R)-L}{(S)-L}](OTf)4 was obtained in an approximate 1.5:1.5:1 ratio which corresponds to an amplification of the homochiral assemblies by a factor of approximately three as evidenced by NMR spectroscopy and m…
Unexpected self-assembly of a homochiral metallosupramolecular M4L4 catenane
Two enantiomerically pure 9,9'-spirobifluorene-based bis(pyridine) ligands 1 and 2 were prepared to study their self-assembly behavior upon coordination to cis-protected palladium(II) ions. Whereas the sterically more demanding ligand, 2, gave rise to the expected dinuclear metallosupramolecular M2L2 rhombi, the sterically less demanding ligand, 1, acts as a template to give rise to a homochiral metallosupramolecular M4L4 catenane.
CCDC 999739: Experimental Crystal Structure Determination
Related Article: Rainer Hovorka, Georg Meyer-Eppler, Torsten Piehler, Sophie Hytteballe, Marianne Engeser, Filip Topić, Kari Rissanen, Arne Lützen|2014|Chem.-Eur.J.|20|13253|doi:10.1002/chem.201403414
CCDC 971933: Experimental Crystal Structure Determination
Related Article: Rainer Hovorka, Sophie Hytteballe, Torsten Piehler, Georg Meyer-Eppler, Filip Topić, Kari Rissanen, Marianne Engeser, Arne Lützen|2014|Beilstein J.Org.Chem.|10|432|doi:10.3762/bjoc.10.40