摘要合成了N,N'-双(水杨基)-1,4-二氨基苯乙炔(SDP)和N,N'-双(3-甲氧基水杨基)-1,4二氨基苯乙炔(MSDP),并通过以下方法确定了它们的分子结构FT-IR和1 H NMR。通过失重法和扫描电子显微镜技术评估了这些化合物在1M盐酸中对AA6061的缓蚀性能。失重研究表明,这些化合物的抑制效率随浓度的增加而增加,并随溶液温度和浸泡时间而变化。还计算了各种热力学参数以研究腐蚀抑制的机理。这些抑制剂的有效性按MSDP> MDP的顺序排列。酸性条件下,席夫碱在AA6061和AA6063合金表面的吸附符合Freundlich吸附等温线。通过扫描电子显微镜(SEM)研究了抑制和未抑制的合金样品的表面特性。关键词缓蚀剂,AA6061合金,AA6063合金,盐酸,席夫碱
作者:Yue Qi、Ou Sun、Yanyan Zhou、Yuan Yao、Zhenyu Cheng、Ting Gao、Hongfeng Li
DOI:10.1039/d0ce00341g
日期:——
was designed, which self-assembled with the Cd2+ and Ln3+ ions and TTA (2-thenoyltrifluoroacetone) forming tetranuclear Cd–Ln complexes, Ln2Cd2L2(TTA)4(OAc)2(CH3OH)2 (Ln = Nd (1), Yb (2) and La (3)). X-ray crystallographic analysis revealed that complex 1 adopted a double-stranded tetranuclear structure, in which the two heteronuclear Cd–Nd units were linked together by phenylene, and each Nd(III) ion
Effect of π-aromatic spacers on the magnetic properties and slow relaxation of double stranded metallacyclophanes with a LnIII–MII–MII–LnIII (LnIII = GdIII, DyIII, YIII; MII = NiII, CoII) linear topology
作者:Carlos Meseguer、María A. Palacios、Antonio J. Mota、Bohuslav Drahoš、Euan K. Brechin、R. Navarrete、Jose M. Moreno、Enrique Colacio
DOI:10.1016/j.poly.2019.05.054
日期:2019.9
properties of these complexes reveals that: (i) all the compounds exhibit weak ferromagnetic exchangeinteractions between the MII and LnIII ions through the bis(phenoxido) bridging groups and weak antiferromagnetic MII–MII interactions transmitted by the acenediimine bridging groups; (ii) DFT calculations not only support the nature and magnitude of the magnetic exchangeinteractions, but also the polarization
Abstract In this study, in order to explore the new kinds of reversible thermochromic materials, four salicylaldehyde Schiff bases (BSP1-4) substituted with methoxy and nitro groups were synthesized and their reversible thermochromic properties were investigated. All compounds were characterized by HNMR, IR, UV–vis, TG-DSC, and SEM techniques. Through HNMR, IR and UV–vis spectra, four target products
Transition-metal Schiff-base complexes as ligands in tin chemistry. Part 7. Reactions of organotin(IV) Lewis acids with [M(L)]2 [M=Ni, Cu and Zn; H2L=N,N′-bis(3-methoxysalicylidene)benzene-1,3-diamine and its -1,4-diamine analog]
and reacted with diorganotin(IV) dihalides, dinitrates and dithiocyanates. Only in the case of those reactions involving [M(3MeO-sal-m-phen)(H2O)]2 with M=Ni or Zn were adducts obtained as the sole products of reaction; the adducts were all tetranuclear complexes. The tetranuclear adduct (SnBun2).[Ni(3MeO-sal-m-phen)(NCS)2]}2· 6MeCN results from salicylaldimine ligands, related by a 2-fold axis, adopting
双核配合物[M(3MeO-sal- m -phen )(H 2 O)] 2 [M = Cu,Ni和Zn; 3MeO–H 2 sal- m -phen = N,N'-双(3-甲氧基水杨基)苯-1,3-二胺]和[M(3MeO-sal- p -phen )(H 2 O)] 2 [M = Cu,Ni和Zn;合成了3MeO–H 2 sal- p -phen = N,N'-双(3-甲氧基水杨基)苯-1,4-二胺],并使其与二卤代二有机锡(IV),二硝酸盐和二硫氰酸盐反应。仅在涉及[M(3MeO-sal- m -phen )(H 2 O)] 2的反应的情况下M = Ni或Zn为唯一的反应产物。加合物均为四核配合物。四核加合物(SnBu n 2)。[Ni(3MeO-sal- m -phen )(NCS)2 ]} 2 ·6MeCN由水杨醛亚胺配体形成,其轴心为2倍,通过桥连作用起桥联作用通过酚氧和亚胺氮原