title: Formation principles for vanadium selenites: the role of pH on product composition.
abstract: A series of organically templated vanadium selenites has been prepared under mild hydrothermal conditions. Single crystals of [C5H14N2][(VO)3(SeO3)2(HSeO3)4], [C5H14N2][VO(SeO3)2], [(R)-C5H14N2][(VO)3(SeO3)2(HSeO3)4], and [(S)-C5H14N2][(VO)3(SeO3)2(HSeO3)4] were grown from VOSO4, SeO2, and 2-methylpiperazine. Controlling the initial pH of the reaction mixture allows for one to select between the compounds found in the VOSO4/SeO2/2-methylpiperazine system, as the solution pH directly affects the relative ratio of the HSeO3(-) and SeO3(2-) concentrations. Moreover, partial resolution of racemic 2-methylpiperazine is observed in [C5H14N2][(VO)3(SeO3)2(HSeO3)4], which is understood through the use of a one-dimensional Ising model. The use of enantiomerically pure 2-methylpiperazine results in fully ordered and fully resolved structures.
authors.affiliation: Department of Chemistry, Haverford College , Haverford, Pennsylvania 19041, United States.
authors.forename: Jacob H
authors.initials: JH
authors.lastname: Olshansky
authors.forename: Karina J
authors.initials: KJ
authors.lastname: Wiener
authors.forename: Matthew D
authors.initials: MD
authors.lastname: Smith
authors.forename: Anahita
authors.initials: A
authors.lastname: Nourmahnad
authors.forename: Max J
authors.initials: MJ
authors.lastname: Charles
authors.forename: Matthias
authors.initials: M
authors.lastname: Zeller
authors.forename: Joshua
authors.initials: J
authors.lastname: Schrier
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Norquist
mesh_terms: D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D010880:Piperidines / Q000737:chemistry*; D020887:Selenious Acid / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D017968:Vanadium Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D009942:Organometallic Compounds; D010880:Piperidines; D017968:Vanadium Compounds; C046482:2-methylpiperidine; D020887:Selenious Acid