与裸金属簇比较,研究了氧化学吸附的钴和铁簇阳离子(Co n O m +和Fe n O m +;n = 3-6,m = 1-3)与NH 3分子的反应。阳离子离子束串联质谱仪在碰撞能量为0.2 eV的条件下检测阳离子。我们已经观察到三种反应产物,它们来自NH 3化学吸附,有或没有金属原子从簇中释放以及化学吸附的NH 3脱氢。反应截面和支化分数受引入金属簇的氧原子数量的强烈影响。氧气化学吸附的具有特定成分(例如Co 4 O +,Co 5 O 2 +和Fe 5 O 2 +)的金属簇对NH 3脱氢反应极强,而Co 4 O 2 +和Fe 4 O 2 +则显示出高反应活性用于NH 3与金属释放的化学吸附。特定组成的脱氢作用增强可以通过OH与相邻Co-H(或Fe-H)形成之间的竞争来解释。
设计并合成了一种新型的带有β-环糊精(β-CD)侧链的水溶性π共轭主链聚合物P1。P1的聚集和分解分别产生淡黄绿色和亮黄色排放。的包合配合能力P1通过与β-CD挂件阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)和客人的缔合相互作用P1为Fe 3+通过三唑间隔物导致的显著增强和减弱完全发射分布P1分别在纯净水中。有趣的是,作为另一种若丹明B(RhB)标记的金刚烷宾的ADRhB被转化为ADRhB(O)(即ADRhB的开放形式),从而在有Fe 3+离子存在的情况下选择性地为垂体宿主β-CD产生RhB发射。P1和ADRhB(O)/ Fe 3+与P1的进一步相互作用通过ADRhB(O)的金刚烷基末端在β-CD中的包合络合而使RhB的发射完全淬灭。而且,即使在受体P1存在的情况下,CTAB与β-CD的更强相互作用也进一步产生了ADRhB(O)的RhB发射。最后,一种新型的β-CD水溶性P1CTAB对
Off–on BODIPY-based chemosensors for selective detection of Al<sup>3+</sup> and Cr<sup>3+</sup>versus Fe<sup>3+</sup> in aqueous media
作者:Andrea Barba-Bon、Laura Calabuig、Ana M. Costero、Salvador Gil、Ramón Martínez-Máñez、Félix Sancenón
DOI:10.1039/c3ra46845c
日期:——
Two new off–on BODIPY-based chemosensors that are highly sensitive for trivalent cations in aqueous solutions are described. Compound 2 exhibits selective sensing of Al3+ and Cr3+ versus Fe3+ through two different channels (UV-vis and fluorescence).
Formation of metal cluster ions by gas-phase ion-molecule reactions: The bond energies of Cr2+ AND Mn2+
作者:R. Houriet、T. Vulpius
DOI:10.1016/0009-2614(89)87130-1
日期:1989.2
Ion-moleculereactions occurring in Cr(CO)6, Fe(CO)5, and Mn2(CO)10 systems are carried out in a Fourier transform ion cyclotron resonance (FTICR) spectrometer. Abundant intensities of bare metal cluster ions can be formed by employing a multiple pulse sequence including selective ejections and photodissociation. In subsequent collisional activation experiments, the binding energies of Cr2+ and Mn2+
Collision‐induced dissociation processes of Nb<sup>+</sup><sub>4</sub> and Fe<sup>+</sup><sub>4</sub>: Fission vs evaporation
作者:S. K. Loh、Li Lian、David A. Hales、P. B. Armentrout
DOI:10.1063/1.455455
日期:1988.7
Collision-induced dissociation (CID) of Nb+4 and Fe+4 with Xe has been studied over an energy range of 0–20 eV with a new instrument designed to study cold cluster ions. The energy dependences of the cross sections are presented. It is found that the lowest energy pathway for Nb+4 CID is fragmentation into molecular ions, or fission. Analysis of this process yields D0(Nb+2–Nb2)=4.3±0.3 eV. Fe+4, on the other hand, fragments only by sequential loss of Fe. Analysis of the lowest energy process gives D0(Fe+3–Fe)=1.8±0.2 eV. No evidence for molecular Fen fragments is observed.
Loh, S. K.; Lian, Li; Hales, David A., Journal of Chemical Physics, 1988, vol. 89, p. 3378 - 3379
作者:Loh, S. K.、Lian, Li、Hales, David A.、Armentrout, P. B.
DOI:——
日期:——
Binary Iron−Dinitrogen Compounds Synthesized by Co-deposition of Mass-Selected Fe, Fe<sub>2</sub>, and Fe<sub>3</sub> with N<sub>2</sub>
作者:T. L. Haslett、S. Fedrigo、K. Bosnick、M. Moskovits、H. A. Duarte、D. Salahub
DOI:10.1021/ja993911l
日期:2000.6.1
Iron-nitrogen binary complexes were synthesized by co-depositing mass-selected Fe+, Fa(2)(+), and Fe-3(+) with N-2 and electrons to form a matrix. The resulting compounds were observed using FTIR spectroscopy. The trigonal-bipyramidal Fe(N-2)(5) structure assigned from the spectra of the Fe+ deposits is supported by density functional calculations involving full geometry optimizations with all symmetry conditions relaxed for Fe(N-2)(x) (x = 1 to 5) binary compounds. FTIR spectra of Fe-2(N-2)(x) and Fe-3(N-2)(y) are also reported. Structures for the dimer and trimer dinitrogen complexes have not been deduced since the spectra are too weak to perform isotopic substitution experiments.