TY  - JOUR
AU  - Kirst, Christin
AU  - Zoller, Florian
AU  - Bräuniger, Thomas
AU  - Mayer, Peter
AU  - Fattakhova-Rohlfing, Dina
AU  - Karaghiosoff, Konstantin
TI  - Investigation of Structural Changes of Cu(I) and Ag(I) Complexes Utilizing a Flexible, Yet Sterically Demanding Multidentate Phosphine Oxide Ligand
JO  - Inorganic chemistry
VL  - 60
IS  - 4
SN  - 1520-510X
CY  - Washington, DC
PB  - American Chemical Society
M1  - FZJ-2021-02725
SP  - 2437 - 2445
PY  - 2021
AB  - The syntheses of a sterically demanding, multidentate bis(quinaldinyl)phenylphosphine oxide ligand and some Cu(I) and Ag(I) complexes thereof are described. By introducing a methylene group between the quinoline unit and phosphorus, the phosphine oxide ligand gains additional flexibility. This specific ligand design induces not only a versatile coordination chemistry but also a rarely observed and investigated behavior in solution. The flexibility of the birdlike ligand offers the unexpected opportunity of open-wing and closed-wing coordination to the metal. In fact, the determined crystal structures of these complexes show both orientations. Investigations of the ligand in solution show a strong dependency of the chemical shift of the CH2 protons on the solvent used. Variable-temperature, multinuclear NMR spectroscopy was carried out, and an interesting dynamic behavior of the complexes is observed. Due to the introduced flexibility, the quinaldinyl substituents change their arrangements from open-wing to closed-wing upon cooling, while still staying coordinated to the metal. This change in conformation is completely reversible when warming up the sample. Based on 2D NMR spectra measured at −80 °C, an assignment of the signals corresponding to the different arrangements was possible. Additionally, the copper(I) complex shows reversible redox activity in solution. The combination of structural flexibility of a multidentate ligand and the positive redox properties of the resulting complexes comprises key factors for a possible application of such compounds in transition-metal catalysis. Via a reorganization of the ligand, occurring transition states could be stabilized, and selectivity might be enhanced.
LB  - PUB:(DE-HGF)16
C6  - 33534576
UR  - <Go to ISI:>//WOS:000620345400035
DO  - DOI:10.1021/acs.inorgchem.0c03334
UR  - https://juser.fz-juelich.de/record/893384
ER  -