Maxime A. Siegler's Vita

Personal Research Project (2008-2009)

Successful attempts at inserting the Ni2+ ion inside the cavity of 15-crown-5 (hereafter, 15C5) have been discussed for the compound [Ni(H2O)2(15C5)](NO3)2 in two recent papers (see link 1 and link 2 for more details). In the meantime, we developed interest in growing crystals of a similar compound containing the same cation, but with the hydrogen sulfate HSO4- counter anion instead.

One aim is to examine the effect of additional hydrogen-bond donors (one donor per HSO4- ion) on the crystal packing of [Ni(H2O)2(15C5)](HSO4)2. Another interest remains the comparisons of the Ni(II) coordination in the seven-coordinate pentagonal bypiramidal geometry in [Ni(H2O)2(15C5)](HSO4)2 with those observed in [M(H2O)2(15C5)](NO3)2 (M = Mg, Mn, Fe, Co, Ni, Cu, Zn). Finally, we discovered a set of three related phases for this compound. The nature of the phase sequence is under investigation.


Maxime A. Siegler Postdoctoral Researcher Small Molecule Crystallography (Service) Supervisor: Prof. Anthony L. Spek Bijvoet Center for Biomolecular Research Crystal and Structural Chemistry Office N802, Utrecht University, Padualaan 8 3584 CH Utrecht The Netherlands Phone: 31-30-2533902 Fax: 31-30-2533940 Email: M.Siegler@uu.nl CV view pdf Comprehensive Publication List view pdf Ph.D. Dissertation view pdf		Personal Research Project (2008-2009) Successful attempts at inserting the Ni2+ ion inside the cavity of 15-crown-5 (hereafter, 15C5) have been discussed for the compound [Ni(H2O)2(15C5)](NO3)2 in two recent papers (see link 1 and link 2 for more details). In the meantime, we developed interest in growing crystals of a similar compound containing the same cation, but with the hydrogen sulfate HSO4- counter anion instead. One aim is to examine the effect of additional hydrogen-bond donors (one donor per HSO4- ion) on the crystal packing of [Ni(H2O)2(15C5)](HSO4)2. Another interest remains the comparisons of the Ni(II) coordination in the seven-coordinate pentagonal bypiramidal geometry in [Ni(H2O)2(15C5)](HSO4)2 with those observed in [M(H2O)2(15C5)](NO3)2 (M = Mg, Mn, Fe, Co, Ni, Cu, Zn). Finally, we discovered a set of three related phases for this compound. The nature of the phase sequence is under investigation.
		Note: The displacement ellipsoid plot was made using the program MERCURY (Macrae et al., 2006), which is available free of charge here.

Education 2007 Ph.D., University of Kentucky, USA - link 2002 B.S., Hautes Études d'Ingénieur, France - link

Selected Publications
[24] S. Bonnet, G. Molnár, J. Sánchez Costa, M. A. Siegler, A. L. Spek, A. Bousseksou, W. Fu, P. Gamez, J. Reedijk. Influence of sample preparation, temperature, light, and pressure on the two-step spin crossover mononuclear compound [Fe(bapbpy)(NCS)2]. Chem. Mater. (2009), 21, 1123-1136. link
[22] M. A. Siegler, M. Lutz. Ni(salen): a system that forms many solvates with interacting Ni atoms. Cryst. Growth & Des. (2009), 9, 2, 1194-1200. link
[21] M. A. Siegler, X. Hao, S. Parkin, C. P. Brock. Five more phases of the structural family [M(H2O)2(15-crown-5)](NO3)2. Acta Crys. B (2008), 64, 738-749. link
[20] M. A. Siegler, S. Parkin, J. P. Selegue, C. P. Brock. The Elusive [Ni(H2O)2(15-crown-5)]2+ cation and related co-crystals of Ni(II) hydrates and 15-crown-5. Acta Crys. B (2008), 64, 725-737. link
[19] S. Bonnet, M. A. Siegler, J. Sánchez Costa, G. Molnár, A. Bousseksou, A. L. Spek, P. Gamez, J. Reedijk. A two-step spin crossover mononuclear Iron(II) complex with a [HS-LS-LS] Intermediate Phase. Chem. Commun. (2008), 43, 5619-5621. link
[12] M. A. Siegler, Y. Fu, G. H. Simpson, D. P. King, S. Parkin, C. P. Brock. An unexpected co-crystal with a variable degree of order: 1:1 rac-1,2-cyclohexanediol/triphenylphosphine oxide. Acta Crys. B (2007), 63, 912-925. link
[1] X. Hao, M. A. Siegler, S. Parkin, C. P. Brock. [M(H2O)2(15-crown-5)](NO3)2: a system rich in polymorphic and modulated phases. Cryst. Growth & Des. (2005), 5, 6, 2225-2232. link