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@ARTICLE{Kirst:893384,
      author       = {Kirst, Christin and Zoller, Florian and Bräuniger, Thomas
                      and Mayer, Peter and Fattakhova-Rohlfing, Dina and
                      Karaghiosoff, Konstantin},
      title        = {{I}nvestigation of {S}tructural {C}hanges of {C}u({I}) and
                      {A}g({I}) {C}omplexes {U}tilizing a {F}lexible, {Y}et
                      {S}terically {D}emanding {M}ultidentate {P}hosphine {O}xide
                      {L}igand},
      journal      = {Inorganic chemistry},
      volume       = {60},
      number       = {4},
      issn         = {1520-510X},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2021-02725},
      pages        = {2437 - 2445},
      year         = {2021},
      abstract     = {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.},
      cin          = {IEK-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {1232 - Power-based Fuels and Chemicals (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1232},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {33534576},
      UT           = {WOS:000620345400035},
      doi          = {10.1021/acs.inorgchem.0c03334},
      url          = {https://juser.fz-juelich.de/record/893384},
}