53108-64-8Relevant academic research and scientific papers
A low-temperature study of the magnetic properties of the molecular cations O2+, Br2+, and I2+
Cader, M. S. R.,Thompson, R. C.,Aubke, F.
, p. 1942 - 1948 (2007/10/02)
Magnetic susceptibility measurements to 4.2 K are reported for O2+-, Br2+-, and I2+-.The data are interpreted utilizing previous results from photoelectron spectroscopy, known crystal structures, magnetic studies on the superoxide ion and the ozonide ion, and in the case of O2+-, previous ESR studies.The magnetic properties of the three materials are quite different.Br2+- obeys Curie-Weiss law between 80 and 4 K: Cm = 0.49 +/- 0.01 cm3 mol-1 K and Τ = -0.74 +/- 0.01 K (with TIP = 120 * 10-6 cm3 mol-1).The magnetic moment decreases slightly from 2.04 μB at room temperature to 1.93 μB at 4 K.I2+- exhibits relatively strong antiferromagnetic coupling with a maximum in ΞM observed at -54 K.The magnetic moment (corrected for TIP contribution of 68 * 10-6 cm3 mol-) decreases from 1.92 μB at 124 K to 0.41 μB at 4 K.Experimental susceptibilities for this compound over the range 300-4 K have been compared to values calculated using three different theoretical models for extended chains of antiferromagnetically coupled paramagnetic species.O2+- exhibits Curie-Weiss behaviour over the range 60-2 K (cm = 0.34 +/- 0.01 cm3 mol-1 K, Τ = -1.90 +/-0.01 K).The magnetic moment, uncorrected for TIP, varies from 1.63 μB at 80 K to 1.17 μB at 2 K, and the presence of weak antiferromagnetic coupling in this material is suggested.Key words: magnetic susceptibilities, dihalogen cations, dioxygenyl cation, low temperature behaviour.
Improved synthesis of [I2+][Sb2F11-] and [Br2+][Sb3F16-] and magnetic, spectroscopic, and some chemical properties of the dihalogen cations I2+ and Br2+
Wilson,Thompson,Aubke
, p. 1489 - 1493 (2008/10/08)
The oxidation of Br2 and I2 by bis(fluorosulfuryl) peroxide, S2O6F2, at a 2:1 mole ratio followed by solvolysis in an excess of antimony(V) fluoride provides a simple, straightforward route to pure [Br2+][Sb3F16-] and [I2+][Sb2F11-]. The dihalogen cations Br2+ and I2+ give resonance Raman spectra and provide suitable solutes for solution studies in fluorosulfuric acid and in superacid media. Magnetic susceptibilities in the range of 80-300 K indicate the presence of a temperature-independent paramagnetic contribution for both compounds. In addition antiferromagnetic interaction caused by an intermolecular iodine-iodine contact seems to occur in [I2+][Sb2F11-]. While attempts to synthesize an IBr+ species were unsuccessful, the cations [BrCl2+] and [Br2Cl+] are obtained in SbF5 solution and characterized by spectroscopic techniques.
