Evidence for three new particles observed in the Crystal Ball detector is presented. The first particle, at 3592 MeV, is seen inclusively in y transitions from +', and is thus a candidate for nl The other two, at 1440 and 1640 MeV, are best seen in exclusive decays of + involving a prompt y, and are thus candidates for bound states of two gluons. Detailed reasons are presented to support the co...

In the title compound, C29H20N2, the dihedral angles subtended by the central p-phenylenediamine ring with respect to the mean plane of the terminal pyrenyl ring system (r.m.s. deviation = 0.027 Å) and the terminal N-phenyl ring are 29.34 (4) and 43.43 (7) , respectively. The conformation about the C N bond is E. In the crystal, molecules are linked by N—H and C—H interactions forming chains pr...

Different crystal phase with a same chemical structure, polymorphous, is a specific physical characteristic which determine the end usage of pigments especially in high performance ones. Diketopyrrolopyrrole DPP derivatives, as one of the innovative in heterocyclic pigments, follow this pattern. Synthesis of pigment red 254 in selected crystal phase using ionic liquids was achieved without any ...

The crystal structure of the title chiral Schiff base compound (E)-3,4-dimethoxy[(1-phenylethyl)iminomethyl]bezyne (1) was determined by single-crystal X-ray diffraction data. The title compound was further characterized by elemental analyses (CHN), FT-IR, 1H-NMR and UV-Vis spectroscopic techniques. It crystallizes in the monoclinic space group P21 with unit cell parameters: a = 19.0121 (2), b...

Crystal size distribution (CSD) in metamorphic rocks provide fundamental information about crystal nucleation and growth rate, growth time and the degree of overstepping. CSD data for garnet, staurolite, kyanite and andalusite crystals from the aureole demonstrate that the earliest formed of these minerals, garnet, has the highest population density and the shortest growth time. The last formed...