Notes

Abstract

€544. A Convenient Solid for Calibration of the Gouy MagneticSusceptibility Apparatus. By B. N. FIGGIS and R. S. NYHOLM. THE measurement of magnetic susceptibilities by the Gouy method is a relative one, the apparatus being calibrated in terms of a substance of known susceptibility, for which water, nickel chloride solution, and powdered cupric sulphate pentahydrate or ferrous ammonium sulphate hexahydrate have been used. The low suceptibility of water is often inconvenient if small tubes are being calibrated. Nickel chloride solution requires accurate analysis before use and ferrous ammonium sulphate is often of questionable purity. This substance and copper sulphate do not pack well and several different values for the susceptibilities of both solids have been reported.The required properties for a calibrant are: (1) Readily available pure;(2) an accurately known and moderate susceptibility (xg = ;(3) stability in moist air;(4) xg must vary in a known and simple way, at least at room temperature; (5) easily and reproducibly packable into the Gouy tube. The complex mercury tetrathiocyanatocobaltate HgCo(CNS), offers some advantages and its susceptibility has therefore been accurately determined. at 20' 1 being used as reference, the gram susceptibility of the complex is 16.44 (-&O.OS) x at 20".As reported elsewhere,l it obeys the Curie-Weiss law, xg cc (T + lO)-l where T is expressed

Magnetic, thermal and spectral characterization of 2,6-dimethoxybenzoates of Co(II), Ni(II) and Cu(II)

“…The calibrant employed was Hg[Co(SCN) 4 ] for which the magnetic susceptibility was assumed to be 1,644⋅10 -5 cm -3 ⋅g -1 . Correction for diamagnetism of the calibrant atoms was calculated by the use of Pascal′s constants [21,22]. Magnetic moments were calculated from Eq.…”

Physicochemical studies and biological activity of mixed ligand complexes involving bivalent transition metals with a novel Schiff base and glycine as a representative amino acid

“…The measured magnetic moment of Co(II) complex (2) is given in Table 3. The theory of magnetic susceptibility of Co(II) ion was given by Schlapp and Penney [53] and the best summary of results on the magnetism behavior of cobalt(II) compounds is that of Figgis and Nyhlom [54].…”

Cobalt(II) Mercury Tetrathiocyanate Complexes with Lewis Bases

“…It is very s~isceptible to moist air and mild heat under which it decomposes to CoHg(SCN),, a crystalline solid known as Gouy's standard for magnetic measurements (8).…”

“…These are included in Table 3. Magnetic susceptibility measurements were made at room temperature by Gouy's as well as Faraday's methods using CoHg(SCN), as standard (8). The diamagnetic corrections were made by the method outlined by Figgis and Lewis (9).…”