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Dendron‐Functionalized Bis(terpyridine)–Iron(II) or –Cadmium(II) Metallomacrocycles: Synthesis, Traveling‐Wave Ion‐Mobility Mass Spectrometry, and Photophysical Properties
Author(s) -
Wang JinLiang,
Li Xiaopeng,
Lu Xiaocun,
Chan YiTsu,
Moorefield Charles N.,
Wesdemiotis Chrys,
Newkome George R.
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201003681
Subject(s) - terpyridine , dendrimer , chemistry , mass spectrometry , ion mobility spectrometry , cyclic voltammetry , spectroscopy , ion , structural isomer , ligand (biochemistry) , photoluminescence , analytical chemistry (journal) , crystallography , polymer chemistry , stereochemistry , metal , materials science , organic chemistry , biochemistry , physics , receptor , optoelectronics , electrode , chromatography , quantum mechanics , electrochemistry
The synthesis, purification, structural analysis, and photophysical properties of a series of five‐, six‐, and seven‐sided Fe II macrocycles and the corresponding hexameric Cd II macrocycle, all prepared by self‐assembly of a 120° bis(terpyridine) ligand modified with first‐ and second‐generation 1→3 C ‐branched dendrons, are reported. All metallomacrocycles were fully characterized by 1 H and 13 C NMR spectroscopy, traveling‐wave ion‐mobility mass spectrometry (TWIM MS), molecular modeling, UV/Vis absorption spectroscopy, photoluminescence, and cyclic voltammetry. A gradual increase of the collision cross sections of the Fe II metallomacrocycles was observed with a successive increase of the number and molecular size of the ligands. The combination of ion‐mobility mass spectrometry and NMR techniques unveils structural features that agree well with calculations. Extinction coefficients and emission are significantly modulated by increasing the ring size and changing the metal ion center from Fe II to Cd II .