Editing Curium (section)

===Organocurium compounds and biological aspects===
[[File:Uranocene-3D-balls.png|thumb|upright=0.5|Predicted curocene structure]]
Organometallic complexes analogous to [[uranocene]] are known also for other actinides, such as thorium, protactinium, neptunium, plutonium and americium. [[Molecular orbital theory]] predicts a stable "curocene" complex (η<sup>8</sup>-C<sub>8</sub>H<sub>8</sub>)<sub>2</sub>Cm, but it has not been reported experimentally yet.<ref>Elschenbroich, Ch. Organometallic Chemistry, 6th edition, Wiesbaden 2008, {{ISBN|978-3-8351-0167-8}}, p. 589</ref><ref>{{cite journal|last1=Kerridge|first1=Andrew|last2=Kaltsoyannis|first2=Nikolas|title=Are the Ground States of the Later Actinocenes Multiconfigurational? All-Electron Spin−Orbit Coupled CASPT2 Calculations on An(η8-C8H8)2(An = Th, U, Pu, Cm)|journal=The Journal of Physical Chemistry A|volume=113|issue=30|date=2009|pmid=19719318|doi=10.1021/jp903912q|pages=8737–8745|bibcode=2009JPCA..113.8737K|url=https://figshare.com/articles/Are_the_Ground_States_of_the_Later_Actinocenes_Multiconfigurational_All_Electron_Spin_Orbit_Coupled_CASPT2_Calculations_on_An_sup_8_sup_C_sub_8_sub_H_sub_8_sub_sub_2_sub_An_Th_U_Pu_Cm_/2840251}}</ref>

Formation of the complexes of the type {{chem|Cm|(|n-C|3|H|7|-BTP)|3}} (BTP = 2,6-di(1,2,4-triazin-3-yl)pyridine), in solutions containing n-C<sub>3</sub>H<sub>7</sub>-BTP and Cm<sup>3+</sup> ions has been confirmed by [[Extended X-ray absorption fine structure|EXAFS]]. Some of these BTP-type complexes selectively interact with curium and thus are useful for separating it from lanthanides and another actinides.<ref name="denecke" /><ref>{{cite journal|last1=Girnt|first1=Denise|last2=Roesky|first2=Peter W.|last3=Geist|first3=Andreas|last4=Ruff|first4=Christian M.|last5=Panak|first5=Petra J.|last6=Denecke|first6=Melissa A.|s2cid=978265|title=6-(3,5-Dimethyl-1H-pyrazol-1-yl)-2,2′-bipyridine as Ligand for Actinide(III)/Lanthanide(III) Separation|journal=Inorganic Chemistry|volume=49|issue=20|date=2010|pmid=20849125|doi=10.1021/ic101309j|pages=9627–9635}}</ref> Dissolved Cm<sup>3+</sup> ions bind with many organic compounds, such as [[hydroxamic acid]],<ref name="pl1">{{cite journal|last1=Glorius|first1=M.|last2=Moll|first2=H.|last3=Bernhard|first3=G.|title=Complexation of curium(III) with hydroxamic acids investigated by time-resolved laser-induced fluorescence spectroscopy|journal=Polyhedron|volume=27|issue=9–10|page=2113|date=2008|doi=10.1016/j.poly.2008.04.002}}</ref> [[urea]],<ref name="pl2">{{cite journal|last1=Heller|first1=Anne|last2=Barkleit|first2=Astrid|last3=Bernhard|first3=Gert|last4=Ackermann|first4=Jörg-Uwe|title=Complexation study of europium(III) and curium(III) with urea in aqueous solution investigated by time-resolved laser-induced fluorescence spectroscopy|journal=Inorganica Chimica Acta|volume=362|issue=4|page=1215|date=2009|doi=10.1016/j.ica.2008.06.016}}</ref> [[fluorescein]]<ref name="pl3">{{cite journal|last1=Moll|first1=Henry|last2=Johnsson|first2=Anna|last3=Schäfer|first3=Mathias|last4=Pedersen|first4=Karsten|last5=Budzikiewicz|first5=Herbert|last6=Bernhard|first6=Gert|title=Curium(III) complexation with pyoverdins secreted by a groundwater strain of Pseudomonas fluorescens|journal=BioMetals|volume=21|issue=2|date=2007|pmid=17653625|doi=10.1007/s10534-007-9111-x|pages=219–228|s2cid=24565144}}</ref> and [[adenosine triphosphate]].<ref name="pl4">{{cite journal|last1=Moll|first1=Henry|last2=Geipel|first2=Gerhard|last3=Bernhard|first3=Gert|title=Complexation of curium(III) by adenosine 5′-triphosphate (ATP): A time-resolved laser-induced fluorescence spectroscopy (TRLFS) study|journal=Inorganica Chimica Acta|volume=358|issue=7|page=2275|date=2005|doi=10.1016/j.ica.2004.12.055}}</ref> Many of these compounds are related to biological activity of various [[microorganism]]s. The resulting complexes show strong yellow-orange emission under UV light excitation, which is convenient not only for their detection, but also for studying interactions between the Cm<sup>3+</sup> ion and the ligands via changes in the half-life (of the order ~0.1 ms) and spectrum of the fluorescence.<ref name="plb" /><ref name="pl1" /><ref name="pl2" /><ref name="pl3" /><ref name="pl4" />

There are a few reports on [[biosorption]] of Cm<sup>3+</sup> by [[bacteria]] and [[archaea]],<ref>{{cite journal|doi=10.1021/es0301166|last1=Moll|first1=H.|last2=Stumpf|first2=T.|last3=Merroun|first3=M.|last4=Rossberg|first4=A.|last5=Selenska-Pobell|first5=S.|last6=Bernhard|first6=G.|title=Time-resolved laser fluorescence spectroscopy study on the interaction of curium(III) with Desulfovibrio äspöensis DSM 10631T|journal=Environmental Science & Technology|volume=38|issue=5|pages=1455–1459|date=2004|pmid=15046347|bibcode = 2004EnST...38.1455M }}</ref><ref>{{cite journal|author=Ozaki, T.|display-authors=etal|url=http://sciencelinks.jp/j-east/article/200305/000020030503A0110480.php|archive-url=https://web.archive.org/web/20090225195752/http://sciencelinks.jp/j-east/article/200305/000020030503A0110480.php|url-status=dead|archive-date=2009-02-25|title=Association of Eu(III) and Cm(III) with Bacillus subtilis and Halobacterium salinarium|journal=Journal of Nuclear Science and Technology|date=2002|volume=Suppl. 3|pages=950–953|doi=10.1080/00223131.2002.10875626|bibcode=2002JNST...39S.950O |s2cid=98319565}}</ref> and in the laboratory both americium and curium were found to support the growth of [[methylotroph]]s.<ref>{{cite journal |last1=Remick |first1=Kaleigh |last2=Helmann |first2=John D. |title=The Elements of Life: A Biocentric Tour of the Periodic Table |journal=Advances in Microbial Physiology |publisher=PubMed Central |date=30 January 2023 |volume=82 |pages=1–127 |doi=10.1016/bs.ampbs.2022.11.001 |pmid=36948652 |pmc=10727122 |isbn=978-0-443-19334-7}}</ref>