TY  - JOUR
A1  - Eckert, Sebastian
A1  - Mascarenhas, Eric Johnn
A1  - Mitzner, Rolf
A1  - Jay, Raphael Martin
A1  - Pietzsch, Annette
A1  - Fondell, Mattis
A1  - Vaz da Cruz, Vinicius
A1  - Föhlisch, Alexander
T1  - From the free ligand to the transition metal complex
BT  - FeEDTA(-) formation seen at ligand K-Edges
JF  - Inorganic chemistry
N2  - Chelating agents are an integral part of transition metal complex chemistry with broad biological and industrial relevance. The hexadentate chelating agent ethylenediaminetetraacetic acid (EDTA) has the capability to bind to metal ions at its two nitrogen and four of its carboxylate oxygen sites. We use resonant inelastic X-ray scattering at the 1s absorption edge of the aforementioned elements in EDTA and the iron(III)-EDTA complex to investigate the impact of the metal-ligand bond formation on the electronic structure of EDTA. Frontier orbital distortions, occupation changes, and energy shifts through metal- ligand bond formation are probed through distinct spectroscopic signatures.
KW  - Energy
KW  - Ligands
KW  - Metals
KW  - Nitrogen
KW  - Oxygen
Y1  - 2022
U6  - https://doi.org/10.1021/acs.inorgchem.2c00789
SN  - 0020-1669
SN  - 1520-510X
VL  - 61
IS  - 27
SP  - 10321
EP  - 10328
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Tang, Kam W.
A1  - Flury, Sabine
A1  - Grossart, Hans-Peter
A1  - McGinnis, Daniel F.
T1  - The Chaoborus pump: Migrating phantom midge larvae sustain hypolimnetic oxygen deficiency and nutrient internal loading in lakes
JF  - Water research
N2  - Hypolimnetic oxygen demand in lakes is often assumed to be driven mainly by sediment microbial processes, while the role of Chaoborus larvae, which are prevalent in eutrophic lakes with hypoxic to anoxic bottoms, has been overlooked. We experimentally measured the respiration rates of C flavicans at different temperatures yielding a Q(10) of 1.44-1.71 and a respiratory quotient of 0.84-0.98. Applying the experimental data in a system analytical approach, we showed that migrating Chaoborus larvae can significantly add to the water column and sediment oxygen demand, and contribute to the observed linear relationship between water column respiration and depth. The estimated phosphorus excretion by Chaoborus in sediment is comparable in magnitude to the required phosphorus loading for eutrophication. Migrating Chaoborus larvae thereby essentially trap nutrients between the water column and the sediment, and this continuous internal loading of nutrients would delay lake remediation even when external inputs are stopped. (C) 2017 Elsevier Ltd. All rights reserved.
KW  - Chaoborus
KW  - Eutrophication
KW  - Oxygen
KW  - Nutrient
KW  - Remediation
Y1  - 2017
U6  - https://doi.org/10.1016/j.watres.2017.05.058
SN  - 0043-1354
VL  - 122
SP  - 36
EP  - 41
PB  - Elsevier
CY  - Oxford
ER  -