The preparations and
magnetic and spectral properties of one ytterbium and two gadolinium phthalocyanines are described and comparisons made with
previous studies. The susceptibility of all three compounds followed a
Curie-Weiss law, with � small, and the magnetic moments were typical for
trivalent rare-earth compounds with little or no coupling between the metal
ions. The e.p.r. signals observed were due to the
metal ions. Structures proposed are Cl(pc)YbCl,2H2O
(where pc = C32H16N8) for ytterbium, and (pc)Gd(pc)H and an associated anionic form for gadolinium. Both
gadolinium materials are stable under certain solution conditions, although the
anionic material tends to decompose and is difficult to obtain from solution. A
polymeric form of phthalonitrile (m.p. 306�C) was
isolated during purification. A simple acid-base equilibrium is proposed for
the gadolinium compounds but it is complicated by the separation procedures and
by the nature and purity of the solvent.
E.s.r. measurements have been made on haemocyanin sampfes derived from the South Australian crayfish, Jaws lalandii. In order to assist in the interpretation of the results the e.s.r. spectra given by copper(ii) in a number of different states of combination have been studied, e.g.. copper( 11) complexes of the following : insulin, the oxygenated condensation product of copper( 11) oxalodihydrazide with acetaldehyde or acetone, copper( I) chloride in acetonitrile or hydrochloric acid, and mercaptosuccinic acid in aqueous and non-aqueous solutions. From a consideration of the spectra obtained in these model systems some of the difficulties involved in the interpretation of the haemocyanin results are resolved.
The criteria for image structure and film properties for velocity measurement by speckle-pattern photography are discussed. Even with low intensity light sources, holographic film is unnecessary, and Plus-X-Pan film will record sufficient detail (in multiple exposures if necessary) to form diffraction pattern fringes. Speckle photography techniques can also be applied to appropriately prepared, incoherently illuminated surfaces, so long as the camera image has the correct speckle-like granular structure. Experiments verifying these ideas are described.
Den aus Yb‐ und Gd(III)‐chlorid oder Gd‐Metall und Phthalocyanin bei 250°C gebildeten Produkten werden aufgrund von analytischen, spektralen und magnetischen Untersuchungen die Zusammensetzungen (I), (II) und (III) zugeordnet.
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