Ag(I), Au(I) and Au(I)-Ag(I) clusters based on tris[(6-methylpyridin-2-yl)methyl]phosphine Ag∙∙∙Ag and Au∙∙∙Au metallophilic interactions (dM–M = 2.90–3.06
Å) proved by both crystallographic
Ultracentennial periodicity of solar activity and soil formationA comparison is made of the periodicity of change in the index of soil formation and solar activity