Platinum magnetic susceptibility

The electronic spectra and magnetic susceptibility of [Ni(21)Cl2] were found to be consistent with a five-coordinate high spin complex. This complex has greater antitumor activity against P388 lymphocytic leukemia test system in mice than cobalt(II), copper(II), zinc(II) and platinum(II) complexes of 21 [187],... 

The first 10 powder diffraction lines for each phase are given in Table 1. Bulk magnetic susceptibility measurements (77-300°K) show that both platinum disulfide and platinum ditelluride are diamagnetic, with susceptibilities of -31(2) and -12(1) emu/mole respectively, as expected for low-spin d6 octahedral ions. Platinum disulfide shows semiconducting behavior between 77 and 300°K, with an activation energy of 0.10(1) eV, whereas platinum ditelluride is metallic. 

Other materials exhibit a minute positive magnetic susceptibility of appr. 10 6— 10 2. This phenomenon is called paramagnetism = appr. 10 6-10 2 and occurs because dipoles of atoms or molecules in a material align themselves in a magnetic field. Some examples are Al, oxygen 02, platinum, titanium. The magnetic dipoles in the... 

Palladium has the highest magnetic susceptibility of the platinum group, and because it is so high it has been termed an incipient ferro-magnet. The implication is that palladium could be induced to become... 

The yellow solid resembles nitrosyl hexafluoro-platinate(v), NO+[PtFj], in appearance, and shows a similar intense absorption in the infrared at 640—650 cm. . attributable to the octahedral v, vibrational mode of PtF,. The magnetic susceptibility of the compound obeys the Curie-Weiss Law in the range 77—298°k with 6 = 35°. As indicated in Table 1 this behaviour is intermediate between that observed - for the quinquevaleht platinum compounds NO+[PtF,] and Pt Fj. ... 

The magnetic susceptibility of these microcrystals as well as commercial platinum foil (99.9%) [Johnson Matthey] has been measured at 300 K using a Faraday apparatus described elsewhere, and their susceptibilities are equal within experimental error (1.00 0.07 and 0.989 0.004 cm /g, respectively). However, low-temperature susceptibility measurements on these microcrystals have revealed a Curie-Weiss law behavior below about 150 K, which has been attributed to their very small size. ... 

All platinum metals are paramagnetic (x > 0). The magnetic susceptibilities of palladium and platinum decrease with increasing temperature, the magnetic susceptibilities of rhodium, iridium, ruthenium, and osmium increase with increasing temperature (Fig. 3.1-272 [1.218]). 

Fig. 3.1-271 Temperature dependence of the magnetic susceptibility of the platinum group metals [1.218, p. 98]...

Many of the blues mentioned in Section 5.2 have been characterized by UV/visible and EPR spectroscopy, and clearly the oligomeric nature of these species warns against any comparisons with the discrete blues discussed above. The isolation of the crystalline blue materials (Table 5.II) has permitted various spectroscopic and theoretical studies to elucidate the origin of the blue color. Magnetic susceptibility, EPR, optical and X-ray photoelectron spectroscopic parameters have all been obtained [65, 66]. The studies on the original platinum—a-pyridone blue have been supplemented by the more recent structures. 

Magnetic susceptibility data show that the platinum—pyridone blue complex behaves as a simple Curie paramagnet with an effective magnetic moment of 1.81 [//B(spin-only) = 1.73], indicating the presence of one unpaired electron [24]. Comparative values for the ethylenediamine and 1-MeUracil complexes are 1.934 and 1.89 respectively. 

---