A tetranuclear Li2Cr2 acetylide precursor complex, [Li(Tp)crm(c=CSiMe3)2(/,t3-pz)]2· (n-pentane)2 (Tp = hydridotris(pyra- zolyl)borate, pz = pyrazolate) (1) has been synthesized and characterized. The X-ray structure analysis shows that the complex contains a Li2Cr2 core bridged by two ,u3-pyrazolates. The magnetic data exhibit the existence of weak antiferromagnetic in- teraction in the cluster.
WANG FengCAO LiLIAO HongLinJIANG JunJIA XiaoLuGAO QianLI DongFeng
利用超声雾化-固相萃取法萃取,气相色谱法和气相色谱-质谱法测定了小茴香中的挥发油.采用正十四烷作为洗脱溶剂,体积为50μL、吹扫气流速为200 m L/min,吹扫时间为5 min.利用优化后的方法测定了小茴香中挥发性成分的种类和含量,与水蒸馏提取法所得结果相似.测定样品溶液中挥发性成分的回收率为65.8%~102.0%,相对标准偏差小于8.0%.
Fluorescent polystyrene（PS）/porphyrin（TPPA） composite nanospheres were successfully fabricated by electrospinning. The SEM images clearly show that owing to adding TPPA in PS, the averaged diameter of the composite nanospheres became smaller, from 1500 to 580 nm. Fourier-transform infrared（FTIR） spectra determined the chemical composition of the resulting PS/TPPA composite nanospheres. The photoluminescent（PL） spectral analysis indicates that the peak position of the composite nanospheres in either solid state or water is identical to that of pure TPPA, at about 652 nm, and is still unchangeable when they are left for at least 20 d, indicating the stable photoluminescent property of the fluorescent composite nanospheres.
SONG YanZHAN Nai-qianYU MiaoYANG Qing-biaoZHANG Chao-qunLI Yao-xian
A tetranuclear Li2Cr2 acetylide precursor complex, [Li(Tp)CrIII(C≡CSiMe3)2(μ_3-pz)]2·(n-pentane)2 (Tp=hydridotris(pyrazolyl)borate, pz = pyrazolate) (1) has been synthesized and characterized. The X-ray structure analysis shows that the complex contains a Li2Cr2 core bridged by two μ_3-pyrazolates. The magnetic data exhibit the existence of weak antiferromagnetic interaction in the cluster.
WANG FengCAO LiLIAO HongLinJIANG JunJIA XiaoLuGAO QianLI DongFeng
