Magnetochemische Untersuchungen, XIV. Das magnetische Verhalten einiger Schwermetallverbindungen des Phthalocyanins

Abstract

I. Allgemeines u n d P r o b l e m s t e l l u n g Kiirzlich ist von R. P. L i n s t e a d und Mitarbeitern z, eine neue Klasse von tief farbigen Stoffen entdeckt worden, die Phthalocyanioe, von denen z. B. der Kupferverbindung die For-me1 I zuzuteilen ist. Die Schwermetallverbindungen des Phthalo-~ cyanins zeichneu sich durch eine auBerordentliche Bestandigkeit aus. So la& sich z. B. das Kupfersalz CuC,,R,,N, sowohl im Hochvakuum wie im indifferenten Gasstrom unzersetzt sublimieren, wobei man Hartglas oder Quarz verwenden muB, 1) XIII.: P. H e n k e l u. W. Klemm, Ztschr. anorg. u. allgem. 2) R.P.Linstead u. Mitarb., Journ. chem, Soc., London 1016ff.(1934). 2'23, 73 (1935). Chem.

Canted Ferromagnetism and Other Magnetic Phenomena in Square-Planar, Neutral Manganese(II) and Iron(II) Octaethyltetraazaporphyrins

“…The magnetic properties of tetrapyrrolic metal complexes (Figure ) have been widely studied, beginning with measurements on metallophthalocyanines made by Klemm and Klemm in 1935 . Among neutral insulating complexes, the square-planar geometry is perhaps the most magnetically interesting.…”

New Insight into the Ground State of FePc: A Diffusion Monte Carlo Study

“…Identifying the electronic configuration under given environments is therefore the most essential starting point for further understandings and applications of the magnetic anisotropy of these compounds, stimulating intensive studies in this direction. An earlier study 7 reported its spin multiplicity being in between S = 1~2 7 . Later, Dale et al .…”

Mössbauer study of the hyperfine interactions and spin dynamics inα-iron(II) phthalocyanine

“…At lower temperatures the curves diverge: while the ␤-FePc behaves as a singlet-ground-state paramagnet down to the lowest temperatures, [11][12][13][14] the ␣-FePc susceptibility increases rapidly with decreasing temperature in close resemblance to the Ising linear chain behavior down to about 10 K. 7 Below 10 K the ac susceptibility and magnetization data proved the existence of ferromagnetism, although the long range ordering peak could not be evidenced from heat capacity experiments, not very surprisingly in view of the very fine powder form of the sample and the chainlike magnetic behavior. However, an interesting feature remains unexplained.…”