制备了一种磁性双功能WO 3 HO-VO(盐)-SiO 2 Fe 3 O 4纳米催化剂,用于从果糖直接合成2,5-二甲酰呋喃(2,5-DFF)。氯硅烷化的SiO 2 @Fe 3 O 4(Cl-SiO 2 @Fe 3 O 4)纳米颗粒充当了这两种功能的平台。生成钨酸通过钨酸钠,将其直接附接在平台上的质子经由亲核-Cl位移。同时,将氧钒与在Cl-SiO 2 @Fe上官能化的盐配体络合3 O 4。表征结果证实了WO 3 HO-VO(盐)-SiO 2 Fe 3 O 4纳米催化剂的成功制备。在最佳一锅系统下,钨酸介导的果糖脱水在1小时内提供了82%的5-羟甲基糠醛(5-HMF)。当共氧化剂ħ 2 ö 2此外,在原位由激活的oxoperoxovanadium物种5-HMF氧化下环境空气15小时后产生的2,5- DFF的71%。发现5-HMF形成的稳定性对2,5-DFF的产生至关重要。除了催化效率和工艺简单之外,WO
The series of cobalt(II) complexes with different Schiff base ligands was synthesized and used as catalyst for the redox carbonylation of aniline and nitrobenzene. Effects of reaction temperature, CO pressure, promoter, and catalyst additions on the conversion of substrate were studied. When Co[(OH)2saloph] — p-toluenesulfonic acid system was used as catalyst, the reaction was carried out at the next
Pd salen complex@CPGO as a convenient, effective heterogeneous catalyst for Suzuki–Miyaura and Heck–Mizoroki cross-coupling reactions
作者:Mahdieh Ghabdian、Mohammad Ali Nasseri、Ali Allahresani、Alireza Motavallizadehkakhky
DOI:10.1007/s11164-018-3455-4
日期:2021.4
A Pd(II) Schiffbasecomplex supported on graphene oxide nanosheets (Pd(II) salen@CPGO) has been synthesized and characterized by FT-IR, ICP-AES, XRD, SEM/EDX and TEM. The synthesized nanocatalyst has been found to be an efficient heterogeneous catalyst for Suzuki–Miyaura and Heck–Mizoroki couplingreactions. Pd(II) salen@CPGO could be separated and recovered easily from the reaction mixture and recycled
hydrogen peroxide in the presence and absence of ethylmethyl imidazolium chloride (EMIM) ionic liquid as solvent. The immobilized complexes proved to be effective catalysts and generally exhibited much higher catalytic performance than their homogeneous analogue. Catalytic performance of the complexes was also found to be closely related to the Schiff base ligands used. Additionally, ion liquid solvent
Structure and conformational motion of seven-coordinate diorganotin(IV) complexes derived from salen and salan type ligands
作者:Rolando Luna-García、Berenice M. Damián-Murillo、Victor Barba、Herbert Höpfl、Hiram I. Beltrán、Luis S. Zamudio-Rivera
DOI:10.1016/j.jorganchem.2009.08.016
日期:2009.11
involved in conformational equilibria that require the presence of intermediates, in which the N → Sn bonds are dissociated. Although the [saleanN3H3]2− ligand is more flexible and basic, a very similar complexing behavior to that of [salenN3H]2− has been found, and there is evidence that it is even a weakerligand. Both ligands show the tendency to adopt a curved conformation within the complex, thus indicating
Synthesis, Structures, and Single‐Molecule Magnetic Properties of Three Dy
<sub>2</sub>
Complexes
作者:Yu Ge、Yuan Huang、Jessenia Lisseth Becerra Montenegro、Yanfeng Cui、Wei Liu、Yahong Li、Bao‐Lin Wang
DOI:10.1002/asia.201801643
日期:2019.4
the ligand backbones on the single‐molecule magneticproperties of dinuclear dysprosium(III) complexes, three ligands—H2L1 (H2L1=N1,N3‐bis(salicylaldehyde)diethylenetriamine), H2L2 (H2L2=N1,N3‐bis(3‐methoxysalicylidene)diethylenetriamine), and H2L3 (H2L3=N1,N3‐bis(5‐chlorosalicyladehyde)diethylenetriamine)—were synthesized and employed to prepare the expected dinuclear dysprosium(III) complexes. The
为了探索配体主链中微妙的结构变化对双核(III)配合物的单分子磁性的影响,使用了三个配体H 2 L 1(H 2 L 1 = N 1,N 3-双(水杨醛) )二亚乙基三胺),H 2 L 2(H 2 L 2 = N 1,N 3-双(3-甲氧基水杨基)二亚乙基三胺)和H 2 L 3(H 2 L 3 = N 1,N 3)-双(5-氯水杨酰醛)二亚乙基三胺)-合成并用于制备预期的双核((III)复合物。这三个配体在水杨醛部分的苯环上的取代基方面不同。(NO的Dy的反应3)3 ⋅ 6 H 2 O,新戊酸,和配体ħ 2大号1,H 2大号2,和H 2大号3个生成络合物与式[镝2(L 1)2( piv)2 ](1),[Dy 2(L 2)2(piv)2 ](2)和[Dy 2(L 3)2(piv)2 ] ⋅2 MeCN(3)。官能团与在水杨醛骨架的苯环改变尺寸有目的的附接导致的Dy的-O-镝键角和Dy的轻微差异⋅⋅⋅中的Dy键长1