Probing the XYZXYZ states through radiative decays

In this work, we have adopted the spin rearrangement scheme in the heavy quark limit and extensively investigated three classes of the radiative decays: $\mathfrak{M}\to (b\bar{b})+\gamma$, $(b\bar{b})\to \mathfrak{M}+\gamma$, $\mathfrak{M} \to \mathfrak{M}^\prime+\gamma$, corresponding to the electromagnetic transitions between one molecular state and bottomonium, one bottomonium and molecular state, and two molecular states respectively. We also extend the same formalism to study the radiative decays of the molecular states with hidden charm. We have derived some model independent ratios when the initial or final states belong to the same spin flavor multiplet. Future experimental measurement of these ratios will test the molecular picture and explore the underlying structures of the $XYZ$ states.Comment: 21 pages, 10 tables Accepted by Phys.Rev.

Diaqua­bis[5-(2-pyrid­yl)-1H-tetra­zolato-κ2 N 1,N 5]cobalt(II)

In the title compound, [Co(C6H4N5)2(H2O)2], the Co atom is bonded to two water mol­ecules and two bidentate 5-(2-pyrid­yl)tetra­zolate ligands resulting in a slightly distorted octa­hedral CoN4O2 coordination geometry. The CoII cation is situated on a crystallographic center of inversion. The asymmetric unit therefore comprises one-half of the mol­ecule. The four N atoms belonging to two bidentate 5-(2-pyrid­yl)tetra­zolate ligands lie in the equatorial plane and the two associated water mol­ecules are observed in the axial coordination sites. The crystal structure exhibits a three-dimensional supra­molecular network assembled by inter­molecular O—H⋯N hydrogen bonds

Diazido­bis{2-[3-(dimethyl­amino)propyl­imino­meth­yl]phenol}manganese(III) perchlorate

The title compound, [Mn(N3)2(C12H18N2O)2]ClO4, was synthesized from manganese(III) acetate, sodium azide and 2-[3-(dimethyl­amino)propyl­imino­meth­yl]phenol by a hydro­thermal reaction. The MnIII ion is hexa­coordinated by two N and two O atoms from two phenolate ligands and two N atoms from two azide ligands. The MnIII cation lies on an inversion centre and, as a result, the asymmetric unit comprises one half-mol­ecule

(4Z)-4-[(2-Chloro­anilino)(phen­yl)methyl­idene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one

The title compound, C23H18ClN3O, exists in an enamine–keto form with the amino group involved in an intra­molecular N—H⋯O hydrogen bond. The five-membered ring is nearly planar, the largest deviation being 0.0004 (7) Å, and makes dihedral angles of 16.62 (6), 41.89 (5) and 71.27 (4)° with the phenyl rings. In the crystal, weak C—H⋯O hydrogen bonds link the mol­ecules into supra­molecular chains along the b axis

The Protective Effect of Dai Medicine Longxue Jie on Cerebral Ischemia Rats

In this study, we observed the effects of Langxue Jie on neurological function score, cerebral edema, cerebral infarction area, cell morphology and oxidative stress indexes of cerebral ischemia rats, and explored its brain protection effect. The middle cerebral artery embolization (MCAO) model of rats was established by the method of thread embolization. The rats were randomly divided into six groups, and the neurological deficit score (mNSS) of rats was recorded for 14 consecutive days. TTC staining was used to determine the volume of cerebral infarction. The water content of brain tissue was determined (%). SOD, CAT, GSH-Px and MDA oxidative stress indexes were detected in serum of rats. Compared with Sham, the cerebral tissue water content, cerebral infarction area and neurological function score in model group were higher, and the activities of SOD, GSH-Px and CAT, indicators of oxidative stress, were decreased with significant differences (P0.05). It is concluded that Longxue Jie can reduce the water content of brain tissue, reduce the area of cerebral infarction, improve cell morphology, reduce oxidative stress response and therefore improve nerve injury, and produce brain protection

Electrostatic force driven helium insertion into ammonia and water crystals under pressure

Abstract: Helium, ammonia and ice are among the major components of giant gas planets, and predictions of their chemical structures are therefore crucial in predicting planetary dynamics. Here we demonstrate a strong driving force originating from the alternation of the electrostatic interactions for helium to react with crystals of polar molecules such as ammonia and ice. We show that ammonia and helium can form thermodynamically stable compounds above 45 GPa, while ice and helium can form thermodynamically stable compounds above 300 GPa. The changes in the electrostatic interactions provide the driving force for helium insertion under high pressure, but the mechanism is very different to those that occur in ammonia and ice. This work extends the reactivity of helium into new types of compounds and demonstrates the richness of the chemistry of this most stable element in the periodic table