Thermal and Antibacterial Studies of Novel Lanthanide–Schiff Base Complexes
摘要:
Novel lanthanide complexes with the general formula [Ln(L)(ONO2)(H2O)(2)] have been synthesized and characterized. {L = 5-bromosalicylidene 4-amino 3-mercapto-1,2,4-triazine-5-one (BrSAMT), Ln = La(III), Ce(III), (Pr(III) Eu(III), Sm(III), Nd(III), Tb(III), Dy(III), and Y(III)}. The thermal, magnetic, molar conductance, and spectral studies confirm that the ligand coordinates through sulfur, azomethine nitrogen, and phenolic oxygen. A scheme of thermal decomposition of the complexes is also proposed. La, Eu, and Yb complexes of BrSAMT show antibacterial activity against gram negative bacteria such as E. coli, Pseudomonas aeruginosa, Salmonella typhi, and Shigella flexneri.
Thermal decomposition of formates. Part IX. Thermal decomposition of rare earth formate anhydrides
作者:Yoshio Masuda
DOI:10.1016/0040-6031(83)80108-7
日期:1983.9
Abstract The thermaldecomposition of rare earth formate anhydrides in a flowing nitrogen atmosphere was studied systematically by means of thermogravimetry and differential thermal analysis. The decomposition consisted of two or three stages 2 Ln(HCO 2 ) 3 → 2 LnO(HCO 2 ) → Ln 2 O 2 ·CO 3 → Ln 2 O 3 The monoxyformate did not appear in the decomposition of the lighter element formates except for lanthanum
Electrochemistry of lanthanoid(III) complexes in dimethyl sulfoxide in the presence of n-Bu4N(acac) and n-Bu4N(dibm)
作者:Akio Iwase、Yoshinori Araki、Reiko Takahashi
DOI:10.1016/0013-4686(90)87070-i
日期:1990.11
lanthanoid Ln(III) complexes was investigated in Me2SO including n-Bu4N(acac) and n-Bu4N(dibm) as ligands (where acac is the acetylacetonate anion and dibm is the diisobutrylmethanate anion). Reversible one electron reduction waves corresponding to Ln(III) complexes→Ln(II) complexes were observed in the concentration range of 5–20 mM of the ligands, including 1 mM lanthanoid perchlorates and 0.1 M TEAP
镧系LN(III)络合物的电化学行为在我研究了2 SO包括Ñ -Bu 4 N(ACAC)和Ñ -Bu 4 N(dibm)作为配体(其中ACAC是乙酰丙酮化物阴离子和dibm是diisobutrylmethanate阴离子) 。在5–20 mM的配体浓度范围内观察到了对应于Ln(III)配合物→Ln(II)配合物的可逆的一个电子还原波,包括1 mM镧系高氯酸盐和0.1 M TEAP。在存在5 mM配体的情况下,在0.1 M TEAP中,镧系元素络合物的半波电势为sce -1.66至-2.61 V ,具体取决于镧系元素(III)离子。
Synthesis of rare earth monoxides
作者:J.M. Leger、N. Yacoubi、J. Loriers
DOI:10.1016/0022-4596(81)90436-9
日期:1981.3
parameter consideration it is concluded that these compounds are the rareearthmonoxides. For Ln =Gd, Dy, Tm, no reaction is observed at 50 kbar and 1000°C. The rareearthmonoxides show a variety of properties: LaO, CeO, PrO, and NdO are metallic with the rareearth in the trivalent state; EuO and YbO are semiconductors with the rareearth in the divalent state; SmO is metallic with samarium in an intermediate
Praseodymium Incorporated AlPO-5 Molecular Sieves for Aerobic Oxidation of Ethylbenzene
作者:B. Sundaravel、C. M. Babu、B. Palanisamy、M. Palanichamy、K. Shanthi、V Murugesan
DOI:10.1166/jnn.2013.7415
日期:2013.4.1
PrAlPO-5 with (Al+P)/Pr ratios of 25, 50, 75 and 100 molecular sieves were successfully synthesized by hydrothermal method. These molecular sieves were characterised using XPS, TPD-NH3, ex-situ pyridine adsorbed IR, TPR, TGA, 27Al and 31P MAS-NMR and ESR studies. The incorporation of praseodymium in the framework of AlPO-5 was confirmed by XRD, DRS UV-vis and 27Al and 31P MAS-NMR analysis. ESR spectrum showed the presence of adsorbed oxygen. The nature and strength of acid sites were identified by ex-situ pyridine adsorbed IR and TPD-NH3. The BET surface area was found to be in the range of 238−272 m2 g−1. The catalytic activity of the molecular sieves was tested for the liquid phase aerobic oxidation of ethylbenzene. Acetophenone was found to be the major product with more than 90% ethylbenzene conversion. ICP-OES analysis revealed the presence of praseodymium intact in the framework of AlPO-5 up to five cycles.
通过水热法成功合成了具有不同(Al+P)/Pr比的PrAlPO-5分子筛(25、50、75和100)。这些分子筛通过XPS、TPD-NH3、原位吡啶吸附红外、TPR、TGA、27Al和31P MAS-NMR以及ESR等方法进行了表征。XRD、DRS UV-vis和27Al及31P MAS-NMR分析证实了镨在AlPO-5骨架中的掺入。ESR光谱显示存在吸附氧。通过原位吡啶吸附红外和TPD-NH3鉴定了酸位的性质和强度。BET比表面积在238−272 m² g⁻¹范围内。这些分子筛的催化活性在乙苯液相空气氧化反应中进行了测试。发现苯乙酮为主要产物,乙苯转化率超过90%。ICP-OES分析显示,在AlPO-5骨架中镨的存在保持完整,经过五个循环周期。
Equilibria and Structure of the Lanthanide(III)-2-hydroxy-1,3-diaminopropane-<i>N</i>,<i>N</i>,<i>N</i>‘,<i>N</i>‘-tetraacetate Complexes: Formation of Alkoxo-Bridged Dimers in Solid State and Solution
作者:Gyula Tircsó、Attila Bényei、Ernõ Brücher、Anita Kis、Róbert Király
DOI:10.1021/ic0517321
日期:2006.6.1
The proton relaxivities of the Gd3+ complex decrease with the increase of pH, and at pH > 6, the low relaxivity values indicate the probable absence of H2O in the inner sphere and the predominance of the eight-coordinated dimer species [Gd2(L-O)2].4- The results of ESI-TOF MS studies of the complexes of La3+, Nd3+, and Lu3+ proved the formation of dinuclear dimers in dilute (0.25 mM) solutions. pH-potentiometric