TY  - JOUR
A1  - Schwarz, Guntram
A1  - Sievers, Torsten K.
A1  - Bodenthin, Yves
A1  - Hasslauer, Ires
A1  - Geue, Thomas
A1  - Koetz, Joachim
A1  - Kurth, Dirk G.
T1  - The structure of metallo-supramolecular polyelectrolytes in solution and on surfaces
N2  - Metal ion induced self-assembly of the rigid ligand 1,4-bis(2,2':6',2 ''-terpyridine- 4'-yl) benzene (1) with Fe(II), Co(II), Ni(II) and Zn(II) acetate in aqueous solution results in extended, rigid- rod like metallosupramolecular coordination polyelectrolytes (MEPE-1). Under the current experimental conditions the molar masses range from 1000 g mol(-1) up to 500 000 g mol(-1). The molar mass depends on concentration, stoichiometry, metal-ion and time. In addition, we present viscosity measurements, small angle neutron scattering and AFM data. We introduce a protocol to precisely control the stoichiometry during self-assembly using conductometry. The protocol can be used with different terpyridine ligands and the above-mentioned metal ions and is of paramount importance to obtain meaningful and reproducible results. As a control experiment we studied the mononuclear 4'- (phenyl)2,2':6',2 ''-terpyridine (3) complex with Ni(II) and Zn(II) and the flexible ligand 1,3- bis[4'-oxa(2,2': 6',2 ''-terpyridinyl)] propane (2) with Ni(II) acetate (Ni-MEPE-2). This ligand does not form extended macroassemblies but likely ring-like structures with 3 to 4 repeat units. Through spin- coating of Ni-MEPE-1 on a solid surface we can image the MEPEs in real space by AFM. SANS measurements of Fe-MEPE-1 verify the extended rigid-rod type structure of the MEPEs in aqueous solution.
Y1  - 2010
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/12094
UR  - http://pubs.rsc.org/en/content/articlehtml/2010/jm/b926783b
SN  - 0959-9428
ER  -