Open AccessCharacterization of self-assembled supramolecular [Ga4L6] host-guest complexes by electrospray ionization mass spectrometry
Author(s) -
Ulla N. Andersen,
Georg Seeber,
Dorothea Fiedler,
Kenneth N. Raymond,
Dayin Lin,
D. L. Harris
Publication year - 2006
Publication title -
journal of the american society for mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.961
H-Index - 127
eISSN - 1879-1123
pISSN - 1044-0305
DOI - 10.1016/j.jasms.2005.10.011
Subject(s) - chemistry , supramolecular chemistry , electrospray ionization , mass spectrometry , electrospray , denticity , non covalent interactions , mass spectrum , crystallography , host–guest chemistry , catechol , characterization (materials science) , molecule , hydrogen bond , organic chemistry , nanotechnology , chromatography , crystal structure , materials science
Self-assembled supramolecular host-guest complexes have been characterized by electrospray ionization mass spectrometry. The spectra obtained by use of a Q-TOF instrument equipped with a Z-spray ion source show primarily the 3- and 4- charge states of the assemblies. The assemblies have the general formula [guest subset Ga4L6]11- where L represents the chelating bidentate catechol ligand 1,5-bis(2',3'-dihydroxy-benzamido)naphthalene and guests are tetramethyl ammonium (Me4N+), tetraethyl ammonium (Et4N+), tetra-n-propyl ammonium (Pr4N+) and decamethylcobaltocenium (Cp*2Co+) cations. For the first time, the mass spectrum of the empty assembly [Ga4L6]12- is reported. This article also reports that provided the electrospray ion source is capable of preserving noncovalent interactions, it is possible to observe host-guest complexes containing both weak binding guests as well as sterically demanding guests in the mass spectra. The present data suggest that electrospray mass spectrometry is a powerful tool for characterization of supramolecular host-guest complexes.