The first thermochromic vanadium(IV) alkoxide system
作者:Giovana G. Nunes、Geraldo R. Friedermann、José Luiz B. dos Santos、Marcelo H. Herbst、Ney V. Vugman、Peter B. Hitchcock、G. Jeffery Leigh、Eduardo L. Sá、Carlos J. da Cunha、Jaísa F. Soares
DOI:10.1016/j.inoche.2004.11.011
日期:2005.1
Abstract The green crystalline, homoleptic vanadium(IV) alkoxide [V2(μ-OPri)2(OPri)6] (I) has been reproducibly prepared in more than 60% yield; its identity was confirmed by chemical and physical methods including single-crystal X-ray diffractometry. Complex I is thermochromic in solution, changing reversibly from royal blue to gold yellow when cooled from 300 to 210 K. The assignment of this thermochromic
摘要 绿色结晶、均质钒 (IV) 醇盐 [V2(μ-OPri)2(OPri)6] (I) 已以超过 60% 的产率重复制备;其身份已通过化学和物理方法(包括单晶 X 射线衍射法)确认。配合物 I 在溶液中是热致变色的,当从 300 冷却到 210 K 时,可逆地从宝蓝色变为金黄色。讨论了这种热致变色行为对单核 (S = 1 2 ) ↔ 双核 (S = 1) 溶液平衡的分配。配合物 I 是工业相关钒-(IV)、-(V) 和混合价钒氧化物的潜在前体。
Vanadium oxide nanostructures derived from a novel vanadium(IV) alkoxide precursor
作者:Willian G. Menezes、Dayane M. Reis、Marcela M. Oliveira、Jaísa F. Soares、Aldo J.G. Zarbin
DOI:10.1016/j.cplett.2007.08.026
日期:2007.9
An uncommon mixed-valence (+V/+IV) vanadium oxide with a layered-structure was prepared by a sol gel process, starting from a novel vanadium(IV) alkoxide, [V(OPri)3}2 (μ-OPri)2]. The obtained product was characterized by FT-IR, Raman spectroscopy, X-ray diffractometry, UV–Vis spectroscopy and EPR. The results indicate that it has a bariandite-like structure and a V10O24 · 9H2O stoichiometry. Preliminary
The first hetero-binuclear alkoxide of iron and vanadium: structural and spectroscopic features
作者:Giovana G. Nunes、Geraldo R. Friedermann、Marcelo H. Herbst、Ricardo B. Barthem、Ney V. Vugman、J.Elaine Barclay、David J. Evans、Peter B. Hitchcock、G.Jeffery Leigh、Eduardo L. Sá、Jaı́sa F. Soares
DOI:10.1016/s1387-7003(03)00250-8
日期:2003.9
The immediate reaction between [V-2(mu-OPri)(2)(OPri)6] (A) and [Fe-2(mu-I)(2)I-2(HOPri)(4)] (B) in toluene/propan-2-ol gives the novel mixed-metal [FeI2(mu-OPri)(2)V(0Pr(i))(2)(HOPri)] (C). Structural, spectroscopic and magnetochemical characterisation are all consistent with a non-oxo vanadium(IV)/high-spin iron(II) formulation; variable-temperature X-band EPR spectra reveal an S = 1/2 <----> S = 1 equilibrium involving the vanadium centres in propan-2-ol solution. (C) 2003 Elsevier B.V. All rights reserved.