| Budget Amount *help |
¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 1987: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1986: ¥6,500,000 (Direct Cost: ¥6,500,000)
|
|---|
| Research Abstract |
The development of diamond-anvil pressure cells enables the effect of pressure on varrious matgerials to be observed, in situ, visually. This is especially importans for the study of polymorphs and crystal growth. Various d8 sauare complexes are formed when Ni^<2+>, Pd^<2_> and Pt^<2_> react withy 1,2-dionedioximes such as dimethylglyoxime. The complexes are chemicallyh stable, and have beautiful colours at atmo- spheric pressure. The colours of the complexes change with pressure shift of the absorption bands. It would be conve- nient if a semiguantitative value of pressure could be de- termined visuallyh from a change in the colour of a material with change in pressure. The molecular structure of bis(1,2- cyclohexanedionedioximato)Pd(II), Pd(niox)_2, is shown in Fig. 1. Visual observation of the comples in the diamond-anvil cell indicated that the colour turned from yellow to orange (at 0.8 to 1.4 GPa), to red(at 1.4 to 2.3 GPa), to purple(at 2 tro 3 GPa), to blue(at 2.7 to 5.5 GPa),to green(at 5.5 to 6.5 GPa) and to pale yellow(above 7 GPa) with increasing pressure. If the relationship between colour and pressure is studied in detail, a semiquantitative value of pressure could be ob- tained from the visual obsewrvation of the change in colour with pressure byh c colorimetric method similar to ph testing paper. Pd(niox)_2 is an excellent pressure indicator in the range 0 to 8 GPa. The colour of bis(dimethyhlglyoximato)Ni(II) which is initially red turns to green at pressure around 1.7 GPa. This is the pressure indicator in the range 0 to 4 GPa. Various bis(1,2-dionedioximato)M(II)(M: Ni, Pd, Pt, etc.) can be used as pressure indicators in the wide pressure region.
|
