Spectroscopic, structural and magnetic investigations of iron(II) complexes based on 1-isopropyl- and 1-isobutyl-substituted tetrazole ligands
摘要:
Two partly new [Fe(intz)(6)](BF4)(2) complexes with n = 3 and 4 (i3tz = 1-isopropyl-1H-tetrazole, i4tz = 1-isobutyl-1H-tetrazole) were synthesized and characterised by X-ray powder diffraction, magnetic susceptibility measurements, vibrational, electronic and Fe-57-Mossbauer spectroscopy as well as DSC. The [Fe(i3tz)(6)](BF4)(2) complex was re-investigated and shows an incomplete spin transition at T-c similar to 109 K, while the [Fe(i4tz)(6)](BF4)(2) features a complete but rather gradual spin transition with T-1/2 = 223 K. In the lack of suitable crystals of [Fe(intz)(6)](BF4)(2) with n = 3 and 4, we synthesized crystals of [Ni(intz)(6)](BF4)(2) with n = 3 and 4, determined their X-ray crystal structures, and proved them to be homeotypic with the respective Fe-complexes by X-ray powder diffraction. DSC measurements showed an endothermic peak for the [Fe(i3tz)(6)](BF4)(2) around T = 260 K not corresponding to a spin transition and suggesting a structural phase transition at this temperature. A well-developed peak at T-p = 225 K matches the spin-transition temperature T-1/2 = 223 K for [Fe(i4tz)(6)](BF4)(2). (C) 2012 Elsevier B.V. All rights reserved.
ABSTRACT: N1-substituted tetrazoles are interesting ligands in transition metal coordination chemistry, especially in the field of spin crossover. Their synthesis is performed in most cases according to the Franke-synthesis, using a primary amine as reagent introducing the substitution pattern. To enhance flexibility in means of substrate scope, we developed a new protocol based on alkylation of lithium
[EN] APOPTOSIS SIGNAL-REGULATING KINASE 1 INHIBITORS AND METHODS OF USE THEREOF<br/>[FR] INHIBITEURS DE KINASES DE RÉGULATION DU SIGNAL D'APOPTOSE 1 ET LEURS PROCÉDÉS D'UTILISATION
申请人:ENANTA PHARM INC
公开号:WO2018209354A1
公开(公告)日:2018-11-15
The present invention discloses compounds of Formula (I), or pharmaceutically acceptable salts, ester, stereoisomer, tautomer, solvate, hydrate, or combination thereof: which inhibit the Apoptosis signal-regulating kinase 1 (ASK-1), which associated with autoimmune disorders, neurodegenerative disorders, inflammatory diseases, chronic kidney disease, cardiovascular disease. The present invention further relates to pharmaceutical compositions comprising the aforementioned compounds for administration to a subject suffering from ASK-1 related disease. The invention also relates to methods of treating an ASK-1 related disease in a subject by administering a pharmaceutical composition comprising the compounds of the present invention. The present invention specifically relates to methods of treating ASK-1 associated with hepatic steatosis, including non-alcoholic fatty liver disease (NAFLD) and non-alcohol steatohepatitis disease (NASH).
Tetrazoles as ligands. Part IV. Iron(II) complexes of monofunctional tetrazole ligands, showing high-spin (p5T2g) ⇋ low-spin transitions
作者:Peter L. Franke、Jaap G. Haasnoot、Adrianus P. Zuur
DOI:10.1016/s0020-1693(00)87299-0
日期:1982.1
tetrazoles and iron(III) tetrafluoroborate lead to the formation of hexacoordinatediron(II) complexes, viz. : [FeL 6 ](BF 4 ) 2 with L = 1-methyltetrazole (MTZ), 1-ethyltetrazole (ETZ), 1-propyltetrazole (PTZ) and 1-isopropyltetrazole (IPTZ). The complexes were identified and characterized by elemental analyses, IR and ligand field spectra and magneticsusceptibility measurements. The iron(II) ions are
摘要1-烷基取代的四唑和四氟硼酸铁(III)导致六配位铁(II)配合物的形成,即。:具有L = 1-甲基四唑(MTZ),1-乙基四唑(ETZ),1-丙基四唑(PTZ)和1-异丙基四唑(IPTZ)的[FeL 6](BF 4)2。通过元素分析,IR和配体场谱以及磁化率测量来鉴定和表征复合物。铁(II)离子被单齿配体八面体包围,并且明显形成单核络合物。在140-80 K的温度范围内,复合物显示出高自旋(5 T 2g)⇋低自旋(1 A 1g)的转变,可以通过从白色到紫色的颜色变化来识别。在过渡之后进行磁测量。
Spin State Crossover, Vibrational, Computational, and Structural Studies of Fe
<sup>II</sup>
1‐Isopropyl‐1
<i>H</i>
‐tetrazole Derivatives
作者:Valentin Smeets、Mariusz Wolff、Juliusz A. Wolny、Volker Schünemann、Marinela M. Dîrtu、Jun‐Yi Ge、Johan Vanacken、Victor Moshchalkov、Yann Garcia
DOI:10.1002/ejic.201700981
日期:2018.1.31
J mol–1 K–1 for 2). Although spin crossover was observed earlier on a powdered sample of 1, we present the X-ray crystal structure and magnetic properties of the crystalline compound for the first time. The crystal structures of four new iron complexes are also provided: two polymorphs of [Fe(iptz)4(NCS)2] (3), and compounds [Fe(iptz)4Cl2] (4) and [Fe(iptz)2(H2O)2(CH3SO3)2] (5). Compound 3, which is the
Dicopper(II) complexes with N3,N4-bridging 1-alkyltetrazoles: Synthesis, crystal structure, magnetic and thermodynamic properties
作者:Sergei V. Voitekhovich、Alexander S. Lyakhov、Mikhail M. Degtyarik、Yuri V. Grigoriev、Dmitriy I. Shiman、Jennifer Klose、Elena N. Stepurko、Andrey V. Blokhin、Ludmila S. Ivashkevich、Berthold Kersting、Oleg A. Ivashkevich
DOI:10.1016/j.jssc.2023.123876
日期:2023.5
with copper(II) tetrafluoroborate hexahydrate and copper(II) nitrate tetrahydrate giving the complexes [Cu2L8(H2O)2]X4, where L = 1-R-tetrazole, X = BF4− or NO3−. Single crystal X-ray analysis showed that the complexes comprised dinuclear cations [Cu2L8(H2O)2]4+, with six tetrazole ligands showing monodentate N4-coordination, and two ones providing N3,N4 bridges between the copper(II) cations; water
发现1-R-四唑(R = Et、i -Pr、t -Bu)与六水合四氟硼酸铜 (II) 和四水合硝酸铜 (II) 反应,生成络合物 [Cu 2 L 8 (H 2 O ) 2 ]X 4,其中 L = 1-R-四唑,X = BF 4 −或 NO 3 −。单晶X射线分析表明,该配合物由双核阳离子[Cu 2 L 8 (H 2 O) 2 ] 4+组成,六个四唑配体显示单齿N 4配位,两个提供N 3,N 4铜(II)阳离子之间的桥接;水分子完成金属离子扭曲的八面体配位。磁化率测量表明,铜 (II) 离子的反铁磁耦合非常弱。复合物 [Сu 2 L 8 (H 2 O) 2 ](BF 4 ) 4发现(L = 1-异丙基四唑)表现出温度诱导的可逆单晶到单晶多晶型相变。对于这种复合物,使用绝热量热法来寻找这种转变的标准热力学特性以及该化合物在 80–370 K 温度范围内的标准热力学函数。此外,在研究过程中获得了组成为