TY  - JOUR
AU  - Schmitz-Antoniak, Carolin
AU  - Izarova, Natalya V.
AU  - Svechkina, Nataliya
AU  - Smekhova, Alevtina
AU  - Stuckart, Maria
AU  - Schmitz, Detlef
AU  - Kögerler, Paul
TI  - Polyoxopalladates as Prototype Molecular Hydrogen Uptake Systems and Novel In situ Hydrogen Detectors on the Nanoscale
JO  - European journal of inorganic chemistry
VL  - 2019
IS  - 3-4
SN  - 1434-1948
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2018-07005
SP  - 448-455
PY  - 2019
AB  - Dodecapalladium(II) oxide‐based molecular nanocubes encapsulating Fe3+ (3d5) or Co2+ (3d7) ions display facile hydrogen uptake with concurrent pronounced magnetization changes that suggests use as molecular hydrogen detection materials. Electronic and magnetic properties were investigated element‐specifically by X‐ray absorption spectroscopy and its associated magnetic circular and linear dichroisms. Hydrogenation reduces the Fe3+ (3d5) ions to a 3d6 state while the Co2+ 3d7 configuration remains largely unaffected. However, in both cases, drastic changes of the crystal field and the magnetic properties were observed and quantified. The spin magnetic moments in the as‐prepared state were obtained to be similar to the ones expected for free ions and are reduced significantly by about 30–40 % for both Fe and Co central ions upon loading with hydrogen. In addition, re‐oxidation and hydrogenation in a second cycle were monitored and the sensitivity to hydrogen and oxygen exposure as a function of the peripheral capping groups is discussed.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000456856100020
DO  - DOI:10.1002/ejic.201800972
UR  - https://juser.fz-juelich.de/record/858087
ER  -