Naslov
Equipping metallo-supramolecular macrocycles with functional groups: assemblies of pyridine-substituted urea ligands

Autori
Troff, Ralf W. ; Hovorka, Rainer ; Weilandt, Torsten ; Lützen, Arne ; Cetina, Mario ; Nieger, Martin ; Lentz, Dieter ; Rissanen, Kari ; Schalley, Christoph A.

Izvornik
Dalton transactions (1477-9226) 41 (2012), 27; 8410-8420

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
urea ligands; metallo-supramolecular macrocycles; X-ray structure; hydrogen-bonding

Sažetak
A series of di-(m-pyridyl)-urea ligands were prepared and characterized with respect to their conformations by NOESYexperiments and crystallography. Methyl substitution in different positions of the pyridine rings provides control over the position of the pyridine N atoms relative to the urea carbonyl group. The ligands were used to self-assemble metallo-supramolecular M2L2 and M3L3 macrocycles which are generated in a finely balanced equilibrium in DMSO and DMF according to DOSY NMR experiments and ESI FTICR mass spectrometry. Again, crystallography was used to characterize the assemblies. Methyl substitution in positions next to the pyridine nitrogen prevents coordination, while the other ligands form small metallo-supramolecular macrocycles. The incorporated urea carbonyl groups provide hydrogen bonding sites which converge towards the center of the assemblies.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA