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Lawrencium chemistry: no evidence for oxidation states lower than 3+ in aqueous solution

Affiliation:	1. Ivanovo State University of Chemistry and Technology, Research Institute of Thermodynamics and Kinetics, 7 Sheremetevsky prospect, 153000 Ivanovo, Russian Federation;2. Department of Chemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland;1. College of Chemistry and Pharmaceutical Engineering, Sichuan University of Science and Engineering, Zigong, Sichuan 643000, PR China;2. College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, PR China;1. Department of Materials Science and Engineering, The Nelson Mandela African Institution of Science and Technology (NM-AIST), Arusha, Tanzania;2. Department of Chemistry, University of Dar es Salaam, Tanzania

Abstract:	Lawrencium (3-min ²⁶⁰Lr) together with other actinides, was produced in the bombardment of a ²⁴⁹Bk target with ¹⁸O ions. There was no sign of a reduction of Lr³⁺ in dilute hydrochloric acid by V²⁺ or Cr²⁺, although in the same experiments, Md³⁺ was reduced to Md²⁺ (E°=−0.2 V). The resulting limit for the reduction potential of the Lr³⁺/Lr¹⁽²⁾⁺ couple is E° < −0.44 V.

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