1. The Earlier the Better: Structural Analysis and Separation of Lanthanides with Pyrroloquinoline Quinone
- Author
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Henning Lumpe, Christoph Haisch, Lena J. Daumann, Franziska Emmerling, Peter Mayer, Kirill V. Yusenko, Anke Kabelitz, Annika Menke, Theresa Block, Ana Guilherme Buzanich, and Rainer Pöttgen
- Subjects
Lanthanide ,chemistry.chemical_element ,rare earth elements ,Context (language use) ,separations ,010402 general chemistry ,01 natural sciences ,Catalysis ,Coordination complex ,chemistry.chemical_compound ,Pyrroloquinoline quinone ,Molecule ,lanthanides ,Inductively coupled plasma mass spectrometry ,chemistry.chemical_classification ,Full Paper ,PQQ ,Extended X-ray absorption fine structure ,010405 organic chemistry ,Organic Chemistry ,General Chemistry ,Full Papers ,Combinatorial chemistry ,ddc ,0104 chemical sciences ,Coordination Chemistry ,chemistry ,ddc:540 ,Europium - Abstract
Chemistry - a European journal 26(44), 10133 - 10139 (2020). doi:10.1002/chem.202002653, Lanthanides (Ln) are critical raw materials, however, their mining and purification have a considerable negative environmental impact and sustainable recycling and separation strategies for these elements are needed. In this study, the precipitation and solubility behavior of Ln complexes with pyrroloquinoline quinone (PQQ), the cofactor of recently discovered lanthanide (Ln) dependent methanol dehydrogenase (MDH) enzymes, is presented. In this context, the molecular structure of a biorelevant europium PQQ complex was for the first time elucidated outside a protein environment. The complex crystallizes as an inversion symmetric dimer, Eu$_2$PQQ$_2$, with binding of Eu in the biologically relevant pocket of PQQ. LnPQQ and Ln1Ln2PQQ complexes were characterized by using inductively coupled plasma mass spectrometry (ICP‐MS), infrared (IR) spectroscopy, $^{151}$Eu‐Mössbauer spectroscopy, X‐ray total scattering, and extended X‐ray absorption fine structure (EXAFS). It is shown that a natural enzymatic cofactor is capable to achieve separation by precipitation of the notoriously similar, and thus difficult to separate, lanthanides to some extent., Published by Wiley-VCH, Weinheim
- Published
- 2020
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