International Summer School PROGRAM - Laboratoire d'Infochimie ...

Polyphosphorus Ligands in Supramolecular Chemistry
M. Scheer, F. Dielmann, A. Schindler and S. Welsch
Prof. Dr. Manfred Scheer, Universität Regensburg, 93040 Regensburg (Germany)
In contrast to common approaches in supramolecular chemistry, our research is
focused on the use of substituent-free Pn-ligand complexes like the tetrahedrane
[CpMo(CO)2(η 3 -P3)], the cyclo-P4 containing complex [Cp''Ta(CO)2(η 4 -P4)] and the
sandwich complex [Cp*Fe(η 5 -P5)] as connecting units for different metal centres to
form oligomers, 1D and 2D coordination polymers, and fullerene-like aggregates. [1]
Furthermore, via molecular recognition it is possible to encapsulate fullerenes like C60
or carboranes by the [Cp*Fe(η 5 -P5)]/CuCl system (see below). [2]
In contrast, the reaction of different Pn-ligand complexes with the Ag I salt of the weakly
coordinating anion [Al{OC(CF3)3}4]ˉ leads to novel polycationic polymers, which show
extensive dissociation and exhibit dynamic behaviour in solution. [3]
The talk will focus
on the structure and properties of the spherical giant molecules as well as on the
dynamic behaviour of the polycationic polymers.
Literature:
[1] (a) J. Bai, A. V. Virovets, M. Scheer, Science 2003, 300, 781; (b) M. Scheer, J. Bai,
B. P. Johnson, R. Merkle, A. V. Virovets, C. E. Anson, Eur. J. Inorg. Chem. 2005, 4023;
(c) M. Scheer, Dalton Trans. 2008, 4372; (d) B. P. Johnson, F. Dielmann, G. Balázs, M.
Sierka, M. Scheer, Angew. Chem. Int. Ed. 2006, 45, 2473. [2] (a) M. Scheer, A.
Schindler, R. Merkle, B. P. Johnson, M. Linseis, R. Winter, C. E. Anson, A. Virovets, J.
Am. Chem. Soc. 2007, 129, 13386; (b) M. Scheer, A. Schindler, C. Gröger, A. V.
Virovets, E. V. Peresypkina, Angew. Chem. Int. Ed., 2009, 48, 5046; (c) S. Welsch, C.
Gröger, M. Sierka and M. Scheer, Angew. Chem. Int. Ed., 2011, 50, 1435–1438. [3] (a)
M. Scheer, L. J. Gregoriades, A. V. Virovets, W. Kunz, R. Neueder, I. Krossing, Angew.
Chem. Int. Ed. 2006, 45, 5689; (b) M. Scheer, L. J. Gregoriades, M. Zabel, J. Bai, I.
Krossing, G. Brunklaus, H. Eckert, Chem. Eur. J. 2008, 14, 282.