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Binding Properties of Two Novel Phosphane‐Modified Tetrapodants and Their Bimetallic Transition Metal Complexes
Author(s) -
Dol Georg C.,
Gaemers Sander,
Hietikko Marko,
Kamer Paul C. J.,
van Leeuwen Piet W. N. M.,
J. M. Nolte Roeland
Publication year - 1998
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199812)1998:12<1975::aid-ejic1975>3.0.co;2-k
Subject(s) - chemistry , bimetallic strip , transition metal , ligand (biochemistry) , palladium , molecule , stereochemistry , rhodium , affinities , metal , binding constant , crystallography , combinatorial chemistry , binding site , catalysis , organic chemistry , biochemistry , receptor
Two novel phosphane ligands 3 and 4 based on the rigid diphenylglycoluril molecule have been synthesized and characterised. Binding studies with 3 and 4 , using 1,3‐dihydroxybenzene derivatives reveal that ligands 3 and 4 behave similarly to clip molecule 5 , which has the same binding site as ligands 3 and 4 . The size of the flexible spacers in the ligands has been varied and the effect of this variation on the association constant of resorcinol derivatives has been determined. These cavity‐containing ligands are able to coordinate two transition metal centres, leading to bimetallic macrocycles. The metallamacrocycles formed from 4 containing platinum or rhodium bind the guest, olivetol (5‐pentylbenzene‐1,3‐diol), almost four times as strongly as the free tetrapodant 4 . Complexes of 4 having palladium centres display similar or reduced binding affinities for resorcinol derivatives, when compared to free 4 . Metal complexes of ligand 3 do not form host‐guest complexes, probably because of a too small a ring‐size of the metallamacrocycle.