ABSTRACT
@#【Objective】 This study aims to summarize the hotspots of acupuncture research in China and abroad in recent 10 years. 【Methods】 The core collection of Web of Science was retrieved, and the literature on experimental and clinical research of acupuncture in China and abroad was collected from January 1, 2012 to December 31, 2021. The included literature was visually analyzed using CiteSpace 6.1.R3. Statistical analysis was carried out in the annual number of papers, authors, countries, and journals. According to the author's country, the literature was divided into Chinese and global categories for keywords clustering analysis and co-citation references analysis independently to obtain hotspots and trends in acupuncture research. 【Results】 There are 1 215 articles in acupuncture experimental medicine, 3 805 articles in acupuncture clinical medicine in China; 551 articles in acupuncture experimental medicine, and 4 538 articles in acupuncture clinical medicine abroad. The number of articles on acupuncture abroad remains stable and flat, whereas the annual number of domestic papers shows a continuously growth trend. LIU Cunzhi from Beijing Hospital of Traditional Chinese Medicine affiliated to Capital Medical University in China is the author who has published the most articles in the field of acupuncture in the recent decade. China is the most productive country in publishing such research articles. Evidence-based Comprehensive and Alternative Medicine is the journal with the most published articles. The mechanisms of acupuncture on nerve regeneration or nerve recovery and research on the mechanisms of acupuncture analgesia are hotspots in experimental acupuncture research, and the treatment of neuropathic pain and dysfunctional diseases with acupuncture are hotspots in clinical acupuncture research in China. Research on the mechanism of protection of the cardiovascular system by acupuncture and research on the mechanism of analgesia by acupuncture are hotspots in experimental research on acupuncture abroad. Studies on the amelioration of inflammatory pain and psychological or psychiatric disorders by acupuncture also serve as hotspots in clinical research on acupuncture abroad. 【Conclusion】 Acupuncture research in China focuses on the treatment of internal diseases and visceral pain, while acupuncture research abroad concentrates on the alleviation and improvement of cancer and psychological and mental diseases. Treatment of internal diseases and mental diseases with acupuncture is the trend of future research.
ABSTRACT
The 3,5-dichlorobenzoate anion, L(-), serves as a bridging ligand and 2,2'-bipyridine, bipy, as a terminal bidentate ligand to yield, through hydrothermal syntheses, the tetranuclear clusters Dy2Co2L10(bipy)2, 1, and Ln2Ni2L10(bipy)2, where Ln is the trivalent La, 2, Gd, 3, Tb, 4, Dy, 5, or Ho, 6, ion. Single-crystal X-ray diffraction reveals that the six complexes are all isomorphous with the monoclinic P21/c space group and with lattice parameters that decrease with the lanthanide contraction. The two cobalt(II) or nickel(II) and two Ln(III) cations are linked by the 10 L(-) anions to generate Dy2Co2 or Ln2Ni2 3d-4f cationic heteronuclear clusters with a slightly bent Co···Dy···Dy···Co or Ni···Ln···Ln···Ni arrangement. Direct current magnetic susceptibility studies reveal that the complexes are essentially paramagnetic, with room-temperature χ(M)T values close to the expected values for two cobalt(II) or nickel(II) and two Ln(III) cations. The temperature dependence of χ(M)T for 1 and 5 is well reproduced by ab initio calculations with the inclusion of weak magnetic exchange between the cobalt(II) or nickel(II) and a dysprosium(III) and between two dysprosium(III) ions. The calculated magnetic exchange parameters are J(Dy-Co) = 0.2 cm(-1) and J(Dy-Dy) = 0.02 cm(-1) for 1 and J(Dy-Ni) = -0.2 cm(-1) and J(Dy-Dy) = 0.03 cm(-1) for 5. Alternating current magnetic susceptibility studies reveal that 1 and 5 exhibit slow magnetic relaxation with effective energy barriers, Ueff, for the reversal of the magnetization for 1 of 82(2) cm(-1) in a 0 Oe dc bias field and 79.4(5) cm(-1) in a 1000 Oe dc bias field and, for 5, 73(1) cm(-1) in a 0 dc bias field; the calculated energies of 66.1(1) and 61.0(1) cm(-1) for the first excited spin-orbit state of dysprosium(III) in 1 and 5 agree rather well with these effective energy barriers. The entire Arrhenius plots of the logarithm of τ, the relaxation rate of the magnetization in 1 and 5, have been fit with contributions from quantum tunneling, direct Raman scattering, and Orbach thermal processes. The observation of a low-temperature magnetization reversal mechanism in 5 but not in 1 may be understood through the calculated exchange energy spectrum in their ground state.
ABSTRACT
Two acentric, i.e., noncentrosymmetric, mononuclear complexes, Co(5-ATZ)(4)Cl(2), 1, and Cu(5-ATZ)(4)Cl(2), 2, where 5-ATZ is the monodentate 5-amino-1-H-tetrazole ligand, have been prepared and characterized. Both complexes crystallize in the tetragonal system with the P4nc space group, a member of the polar noncentrosymmetric 4mm class, and thus both 1 and 2 can exhibit ferroelectric and nonlinear optical properties. Magnetic studies indicate that 1 is a paramagnetic high-spin cobalt(II) complex with a rather extensive spin-orbit coupling, modeled as a zero-field splitting parameter, D, of ±91(3) cm(-1) and with very weak long-range antiferromagnetic exchange interactions. Direct current (dc) and ac magnetic studies indicate that 2 is a paramagnetic copper(II) complex that exhibits weak ferromagnetic exchange interactions below 15 K. Both 1 and 2 exhibit ferroelectric hysteresis loops at room temperature with remanent polarizations of 0.015 µC/cm(2) and coercive electric fields of 5.5 and 5.7 kV/cm, respectively.
