Actinide and Lanthanide Chemistry
Room Temperature Ionic Liquids
Room temperature ionic liquids (RTIL) form potentially important solvents
in novel nuclear waste reprocessing methods. We use infrared, Raman,
and NMR spectroscopies to study the solvation, speciation, and
complexation behaviors of actinides and lanthanides in these fascinating
solvents. We are particularly interested in the interactions between water
and metal ions in imidazolium-based RTIL.
We are currently working to characterize uranyl(VI)-amidoxime
complexes in aqueous solutions using ATR-FTIR and Raman
The aquatic chemistry of uranium influences important technological,
biological, and geochemical processes, including mobility and fate in the
geologic subsurface, bioavailability and carcinogenicity, nuclear fuel
reprocessing, and the migration of nuclear wastes. Ph.D. student
Adetayo Mustapha is using electrospray ionization mass spectrometry to
study uranium, vanadium, and iron complexes with amidoxime ligands
that are used to adsorb uranium from seawater.
Adetayo has also investigated the coordination of Ag+ and Cu2+ with
phosphorothioate pesticides as a way to improve the detection of these
pesticides using ESI-MS.
Mustapha, A. M.; Pasilis, S. P.* Gas-Phase Copper and Silver Complexes with
Phosphorothioate and Phosphorodithioate Pesticides Investigated using
Electrospray Ionization Mass Spectrometry. J. Mass Spectrom. 2015, 50, 145-152.
Mustapha, A. M.; Pasilis, S. P.* Probing Uranyl(VI) Speciation in the Presence of
Amidoxime Ligands using Electrospray Ionization Mass Spectrometry. Rapid
Commun. Mass Spectrom. 2013, 27, 2135-2142.
Stark, T. D.*; Matsumoto, T.; Lösch, S.; Boakye, P. A.; Balemba, O. B.; Pasilis, S.
P.; Hofman, T. Isolation and Structure Elucidation of Highly Antioxidative 3,8’’-
linked Biflavanones and Flavanon-C-glycosides from Garcinia buchananii Bark. J.
Agric. Food Chem. 2012, 60, 2053-2062.
Boakye, P. A.; Stenkamp-Strahm, C.; Bhattarai, Y; Heckman, M. D.; Brierley, S.
M.; Pasilis, S. P.; Balemba, O. B.* 5-HT3 and 5-HT4 Receptors Contribute to the
Anti-motility Effects of Garcinia buchananii Bark Extract in the Guinea Pig Distal
Colon. Neurogastroenterol. Motil. 2012, 24, e27-e40.
Boakye, P. A.; Brierly, S. M.; Pasilis, S. P.; Balemba, O. B.* Garcinia buchananii
bark extract is an effective anti-diarrheal remedy for lactose-induced diarrhea. J.
Ethnopharmacology. 2012, 142, 539-547.
Pasilis, S. P.*; Blumenfeld, A. Effect of Nitrate, Perchlorate, and Water on
Uranyl(VI) Speciation in a Room Temperature Ionic Liquid: A Spectroscopic
Investigation. Inorg. Chem. 2011, 50, 8302-8307.
Pasilis, S. P.* Desorption Electrospray Ionization Mass Spectrometry.
Encyclopedia of Analytical Chemistry. Supplementary Volumes S1-S3. John Wiley
& Sons, Ltd: Chichester, 2011. pp 1395-1415.
Wai, C. M.*; Liao, Y. J.; Liao W. S.; Tian G. X.; Addleman R. S.; Quach, D.; Pasilis,
S. P. Uranium Dioxide in Ionic Liquid with a Tri-n-butylphosphate-HNO3 Complex–
Dissolution and Coordination Environment. Dalton Trans. 2011, 40, 5039-5045.
Quach, D. L.; Wai, C. M.; Pasilis, S. P.* Characterization of Uranyl(VI) Nitrate
Complexes in a Room Temperature Ionic Liquid Using Attenuated Total Reflection-
Fourier Transform Infrared Spectrometry. Inorg. Chem. 2010, 49, 8568-8572.
Pasilis S. P.*; Van Berkel, G. J.* Atmospheric Pressure Surface
Sampling/Ionization Techniques for Direct Coupling of Planar Separations with
Mass Spectrometry. J. Chromatogr. A 2010, 1217, 3955–3965.
Pasilis S. P.; Van Berkel, G. J.* Modern Atmospheric Pressure Surface
Sampling/Ionization Techniques in Mass Spectrometry. Encyclopedia of
Spectroscopy and Spectrometry (2nd Ed.) 2010, 1544–1555.
Please click here to see a complete list of my publications.
Office: Renfrew 003
University of Idaho
Department of Chemistry
P.O. Box 442343
Moscow ID 84844-2343
Current Research Interests
Physical Chemistry Lab
Separation Theory and
Mustapha, A. M. and Pasilis, S. P. Gas Phase Complexes formed between
Amidoxime Ligands and Vanadium or Iron Investigated using Electrospray
Ionization Mass Spectrometry. 63rd ASMS Conference on Mass Spectrometry and
Allied Topics. St. Louis, MO, May 31–June 4, 2015.
Joshi, R. and Pasilis, S. P. Lanthanum(III) Complexes with Tributylphosphate and
Tributylphosphine Oxide in an Imidazolium-based Ionic Liquid. 248th National
Meeting of the American Chemical Society, San Francisco, CA, August 10–14,
Joshi, R. and Pasilis, S. P. Interaction of Phosphate Esters and Phosphine Oxides
with Imidazolium-based Room Temperature Ionic Liquids. 247th National Meeting of
the American Chemical Society, Dallas, TX, March 16–20, 2014.
Mustapha, A. M. and Pasilis, S. P. Improved ESI-MS Detection of Phosphorothioate
Pesticides through Complexation with Ag+ and Cu2+. Pittsburgh Conference 2014,
Chicago, IL, March 2–6, 2014.