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On the Hydrogen Oxalate Binding Motifs onto Dinuclear Cu and Ag Metal Phosphine Complexes
Author(s) -
Kwasigroch Björn,
Khuu Thien,
Perez Evan H.,
Denton Joanna K.,
Schneider Erik K.,
Straßner Annika,
Theisen Marvin,
Kruppa Sebastian V.,
Weis Patrick,
Kappes Manfred M.,
Riehn Christoph,
Johnson Mark A.,
NiednerSchatteburg Gereon
Publication year - 2021
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.202102768
Subject(s) - chemistry , carboxylate , oxalate , metal , crystallography , phosphine , hydrogen , ion , infrared spectroscopy , hox gene , stereochemistry , inorganic chemistry , organic chemistry , biochemistry , transcription factor , gene , catalysis
Abstract We report the binding geometries of the isomers that are formed when the hydrogen oxalate ((CO 2 ) 2 H=HOx) anion attaches to dinuclear coinage metal phosphine complexes of the form [M 1 M 2 dcpm 2 (HOx)] + with M=Cu, Ag and dcpm=bis(dicyclohexylphosphino)methane, abbreviated [MM] + . These structures are established by comparison of isomer‐selective experimental vibrational band patterns displayed by the cryogenically cooled and N 2 ‐tagged cations with DFT calculations of the predicted spectra for various local minima. Two isomeric classes are identified that feature either attachment of the carboxylate oxygen atoms to the two metal centers (end‐on docking) or attachment of oxygen atoms on different carbon atoms asymmetrically to the metal ions (side‐on docking). Within each class, there are additional isomeric variations according to the orientation of the OH group. This behavior indicates that HOx undergoes strong and directional coordination to [CuCu] + but adopts a more flexible coordination to [AgAg] + . Infrared spectra of the bare ions, fragmentation thresholds and ion mobility measurements are reported to explore the behaviors of the complexes at ambient temperature.