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Stabilization of Pd(III) states in nano-wire coordination complexes
Masahiro Yamashita1, Shinya Takaishi
1Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aza-Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan. yamasita@agnus.chem.tohoku.ac.jp
Researchers achieved the Mott-Hubbard (MH) state in palladium (Pd) complexes, previously only seen in nickel (Ni) complexes. This breakthrough was enabled by controlling palladium-palladium distances, offering new insights into halogen-bridged metal complexes.
Area of Science:
- Solid State Chemistry
- Materials Science
- Coordination Chemistry
Background:
- Quasi-one-dimensional halogen-bridged complexes (MX-chains) exhibit distinct electronic states.
- Platinum (Pt) and Palladium (Pd) complexes typically form charge-density wave (CDW) states.
- Nickel (Ni) complexes exclusively form Mott-Hubbard (MH) states.
Purpose of the Study:
- To stabilize the Mott-Hubbard (MH) state in palladium (Pd) complexes.
- To investigate the factors determining the electronic states in bromo-bridged Pd compounds.
Main Methods:
- Partial substitution of Pd with Ni ions in [Ni(1-x)Pd(x)(chxn)(2)Br]Br(2) complexes.
- Application of chemical pressure using long alkyl chains as counter-anions in [Pd(en)(2)Br](C(n)-Y)(2).H(2)O complexes.
Main Results:
- Successfully stabilized the Pd(III) MH state for the first time.
- Demonstrated that Pd-Pd distances dictate the electronic state.
- Identified a critical Pd-Pd distance of 5.26 Å for transitioning between CDW and MH states.
Conclusions:
- The electronic state of bromo-bridged Pd complexes is tunable.
- Controlling interatomic distances is key to manipulating CDW and MH states.
- This work expands the understanding of electronic phase control in MX-chain systems.
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