Binding Properties of Two Novel Phosphane-Modified Tetrapodants and Their Bimetallic Transition Metal Complexes

✍ Scribed by Georg C. Dol; Sander Gaemers; Marko Hietikko; Paul C. J. Kamer; Piet W. N. M. van Leeuwen; Roeland J. M. Nolte

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 192 KB
• Volume: 1998
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/(sici)1099-0682(199812)1998:12<1975::aid-ejic1975>3.0.co;2-k

✦ Synopsis

Two novel phosphane ligands 3 and 4 based on the rigid able to coordinate two transition metal centres, leading to bimetallic macrocycles. The metallamacrocycles formed from diphenylglycoluril molecule have been synthesized and characterised. Binding studies with 3 and 4, using 1,3-4 containing platinum or rhodium bind the guest, olivetol (5pentylbenzene-1,3-diol), almost four times as strongly as the dihydroxybenzene derivatives reveal that ligands 3 and 4 behave similarly to clip molecule 5, which has the same free tetrapodant 4. Complexes of 4 having palladium centres display similar or reduced binding affinities for resorcinol binding site as ligands 3 and 4. The size of the flexible spacers in the ligands has been varied and the effect of this derivatives, when compared to free 4. Metal complexes of ligand 3 do not form host-guest complexes, probably because variation on the association constant of resorcinol derivatives has been determined. These cavity-containing ligands are of a too small a ring-size of the metallamacrocycle.

[a] Measured in C 6 D 6 . Ϫ [b] Measured in CDCl 3 . Ϫ [c] Measured in CD 3 CN. Ϫ [d] 1 J Pt-P (cis). Ϫ [e] 1 J Rh-P (trans). Ϫ [f] Measured in KBr. Ϫ [g] ν(CO). Ϫ [h] ν(CC). Ϫ [i] ν[(CO) Rh ]. Ϫ [j] ν[(CO) Ir ].