Die Titelverbindungen entstehen bei der Einwirkung der silylierten Phosphanimine Me3SiNPR3 (R = CH3, C2H5) auf CrCl2(THF)2, PdCl2 und CuCl2 in Dichlormethan‐Suspension. Die drei Donor‐Acceptor‐Komplexe werden durch ihre IR‐Spektren und durch Kristallstrukturanalysen charakterisiert. [CrCl2(Me3SiNPMe3)2]: Raumgruppe Pccn, Z = 4, Strukturlösung mit 2104 unabhängigen beobachteten Reflexen, R = 0,045. Gitterkonstanten bei −70°C: a = 1326,3; b = 1562,5; c = 1171,5 pm. In der monomeren Molekülstruktur ist das Chromatom planar in der trans‐Konfiguration von den Cl‐Atomen und den N‐Atomen der Phosphanimin‐Liganden koordiniert mit Abständen CrCl = 235,94 pm und CrN = 211,7 pm. [PdCl2(Me3SiNPEt3)2]: Raumgruppe P21/n, Z = 2, Strukturlösung mit 2412 unabhängigen beobachteten Reflexen, R = 0,031. Gitterkonstanten bei 20°C: a = 917,3; b = 1390,2; c = 1161,7 pm, β = 95,80°. In der monomeren Molekülstruktur ist das Palladiumatom planar in der trans‐Konfiguration von den Cl‐Atomen und den N‐Atomen der Phosphaniminliganden koordiniert mit Abständen PdCl = 222,9 pm und PdN = 209,5 pm. [CuCl2(Me3SiNPMe3)]2: Raumgruppe Pbca, Z = 4, Strukturlösung mit 1861 unabhängigen beobachteten Reflexen, R = 0,067. Gitterkonstanten bei −70°C: a = 1440,2; b = 1205,1; c = 1536,5 pm. Die Verbindung bildet zentrosymmetrische dimere Moleküle, in denen die Cu‐Atome über nahezu symmetrische Chlorobrücken mit CuCl‐Abständen von 231,4 pm verknüpft sind. Der Abstand CuN beträgt 196,7 pm.

Dissimilar metals of copper (T2) and aluminium (1035) were brazed by vacuum brazing technology. Microstructure and phase constitution for the Cu/Al vacuum brazing were studied by means of metallography, electron probe microanalyser and X-ray diffraction. Experiment results indicated that an obvious transition layer of copper based solution was formed near the interface of copper and braze metal. The brazing seam zone mainly consists of various solid solutions between many elements and a few intermetallic compounds which are hard and brittle. This is favourable to the enhancing of service performance of the Cu/Al brazed joint. Process parameters of vacuum brazing are: brazing temperature T5425uC, vacuum level510 23 Pa, holding time t515 min.

We investigated the kinetics of conversion of hemin to β-hematin in aqueous-acetate medium in absence and in presence of two concentrations of chloroquine by using eleven reported kinetic equations. The two best kinetic equations are the combination of order 1 and Avrami and the combination of second order and logistic equations, based on the statistical parameters variance and overall errors. The best fitted equations are composed of two terms from which we model the formation of β-hematin as the result of two processes: the availability of reactive precursors and the formation of nucleation and growth sites. The crystals exhibit needle-like morphologies of about 760 nm long and 140 nm wide. However, the increment of chloroquine favors the formation of crystal twinning with non-homogenous distribution, crystals with lower sizes of similar heights and widths, and crystals symmetrically tapered at the ends of the needles. The lattice volumes, obtained from Rietveld analysis of powder X-ray diffraction patterns, were not regularly affected by chloroquine. The main IR absorption bands did not appreciably change in positions nor in intensities with varying chloroquine concentration. However, important changes were observed in the 2000-4000 cm-1 region. We used Density Functional Theory calculations to understand these changes.