03_06_86 - DIAMAGNETIC SUSCEPTIBILITY OF SELECTED ORGANIC...

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DIAMAGNETIC SUSCEPTIBILITY OF SELECTED ORGANIC COMPOUNDS When a material is placed in a magnetic field H , a magnetiza- tion M is induced in the material which is related to H by M = κ H , where κ is called the volume susceptibility. Since H and M have the same dimensions, κ is dimensionless. A more useful parameter is the molar susceptibility χ m , defined by χ m = κ V m = κ M where V m is the molar volume of the substance, M the molar mass, and ρ the mass density . When the cgs system is used, the custom- ary unit for χ m is cm 3 mol -1 ; the corresponding SI unit is m 3 mol -1 . Substances with no unpaired electrons are called diamagnetic; they have negative values of χ m . This table gives values of the diamagnetic susceptibility for about 400 common organic compounds. All values refer to room temperature and atmospheric pressure and to the physical form that is stable under these conditions. Substances are arranged by molecular formula in Hill order. A more extensive table may be found in Reference 1. In keeping with customary practice, the molar susceptibility is given here in units appropriate to the cgs system. These values should be multiplied by 4π to obtain values for use in SI equations (where the magnetic field strength H has units of A m -1 ). References 1. Landolt-Börnstein, Numerical Data and Functional Relationships in Science and Technology, New Series, II/16 , Diamagnetic Susceptibility, Gupta, R. R., Ed., Springer-Verlag, Heidelberg , 1986 . 2. Barter, C., Meisenheimer, R. G., and Stevenson, D. P., J. Phys. Chem . 64, 1312, 1960. 3. Broersma, S., J. Chem. Phys . 17, 873, 1949. Molecular formula Compound - χ m /10 -6 cm 3 mol -1 CBrCl 3 Bromotrichloromethane 73.2 CBr 4 Tetrabromomethane 93.7 CClF 3 Chlorotrifluoromethane 45.3 CClN Cyanogen chloride 32.4 CCl 2 F 2 Dichlorodifluoromethane 52.2 CCl 2 O Carbonyl chloride 47.9 CCl 3 F Trichlorofluoromethane 58.7 CCl 3 NO 2 Trichloronitromethane 75.3 CCl 4 Tetrachloromethane 66.8 CHBrCl 2 Bromodichloromethane 66.3 CHBr 3 Tribromomethane 82.6 CHCl 3 Trichloromethane 58.9 CHI 3 Triiodomethane 117.1 CH 2 BrCl Bromochloromethane 55.1 CH 2 Br 2 Dibromomethane 65.1 CH 2 Cl 2 Dichloromethane 46.6 CH 2 I 2 Diiodomethane 93.1 CH 2 N 2 Cyanamide 24.8 CH 2 O Formaldehyde 18.6 CH 2 O 2 Formic acid 19.9 CH 3 Br Bromomethane 42.8 CH 3 Cl Chloromethane 32.0 CH 3 F Fluoromethane 17.8 CH 3 I Iodomethane 57.2 CH 3 NO Formamide 23.0 CH 3 NO 2 Nitromethane 21.0 CH 4 Methane 17.4 CH 4 N 2 O Urea 33.5 CH 4 O Methanol 21.4 CH 5 N Methylamine 27.0 CI 4 Tetraiodomethane 136 Molecular formula Compound - χ m /10 -6 cm 3 mol -1 CN 4 O 8 Tetranitromethane 43.0 C 2 ClF 3 Chlorotrifluoroethylene 49.1 C 2 Cl 4 Tetrachloroethylene 81.6 C 2 Cl 6 Hexachloroethane 112.8 C 2 HCl 3 Trichloroethylene 65.8 C 2 HCl 3 O Trichloroacetaldehyde 73.0 C 2 HCl 3 O Dichloroacetyl chloride 69.0 C 2 HCl 3 O 2 Trichloroacetic acid 73.0 C 2 HCl 5 Pentachloroethane 99.1 C 2 HF 3 O 2 Trifluoroacetic acid 43.3 C 2 H 2 Acetylene
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This note was uploaded on 02/04/2011 for the course CHEM 101 taught by Professor Dr.n during the Spring '10 term at McMaster University.

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03_06_86 - DIAMAGNETIC SUSCEPTIBILITY OF SELECTED ORGANIC...

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