TY  - THES
A1  - Schwarz, Guntram
T1  - Charakterisierung von Eigenschaften und Struktur Metallo-supramolekularer Funktionseinheiten
Y1  - 2008
CY  - Potsdam
ER  - 
TY  - THES
A1  - Schwarz, Guntram
T1  - Charakterisierung von Eigenschaften und Struktur Metallo-supramolekularer Funktionseinheiten
Y1  - 2008
CY  - Potsdam
ER  - 
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  - http://pubs.rsc.org/en/content/articlehtml/2010/jm/b926783b
U6  - https://doi.org/10.1039/B926783b
SN  - 0959-9428
ER  - 
TY  - JOUR
A1  - Schwarz, Guntram
A1  - Bodenthin, Yves
A1  - Geue, Thomas
A1  - Koetz, Joachim
A1  - Kurth, Dirk G.
T1  - Structure and properties of dynamic rigid rod-like metallo-supramolecular polyelectrolytes in solution
N2  - Metal-ion-induced self-assembly in aqueous solution of the rigid ligand 1,4-bis(2,2':6',2 ''-terpyridine-4'-yl)benzene (1) with Fe(OAc)(2) and Ni(OAc)(2) is investigated with viscosimetry, SANS, and AFM. Ligand 1 forms extended, rigid-rod like metallo-supramolecular coordination polyeectrolytes (MEPEs) with a molar mass of up to 200 000 g mol(-1) under the Current experimental conditions. The molar mass depends oil concentration, stoichiometry, and time. By spin-coating MEPEs oil a solid surface, we call image the MEPEs in real space by AFM. Both AFM and SANS confirm the extended rigid-rod-type structure of the MEPEs. As a control experiment, we also studied the flexible ligand 1,3-bis[4'-oxa(2,2':6',2 ''-terpyridinyl)]propane (2). Ligand 2 does not form extended macro-assemblies but likely ringlike structures with three 10 four repeat units. Finally, we present it protocol to control the stoichiometry during self-assembly using conductometry, which is of paramount importance to obtain meaningful and reproducible results.
Y1  - 2010
UR  - http://pubs.acs.org/doi/full/10.1021/ma902057f
U6  - https://doi.org/10.1021/Ma902057f
SN  - 0024-9297
ER  -