The Molecular Zeeman-Effect in 1,3-Difluorobenzene and 3-Methylfurane

Abstract

Abstract The rotational Zeeman effect of 1,3-difluorobenzene and 3-methylfurane has been studied at magnetic fields close to 25 kG. From the splittings of the rotational transitions the diagonal elements of the molecular g-tensors and the anisotropics of the diagonal elements of the magnetic susceptibility tensors have been determined as: g aa =-0.0486±'0.0002, g bb = -0.0315 + 0.0003, g cc = +0.0116±0.0003, (2 X aa -X bb -X cc )N L = (46.6 ± 0.4) · 10 -6 erg/ (G 2 mole), (2 X bb -X cc -Z aa )N L = (55.7 ± 0.4) · 10 -6 erg/(G 2 mole) for 1,3-difluorobenzene and as g aa = -0.0716 + 0.0006, g bb = -0.0370±0.0003, g cc =0.0222±0.0003, (2 X aa -X bb -X cc )N L = (25.7 ± 0.6) · 10 -6 erg/(G 2 mole), (2 X bb -X cc -X aa )N L = (43.1 ±0.5) · 10 -6 erg/(G 2 mole) for 3-methylfurane. From comparison with related compounds position dependent substitution effects on the susceptibility anisotropics become appearent. The scheme of local atom susceptibilities is extended to fluorine containing molecules.