Photodissociation of iron-pyrene and iron-perylene cation complexes

Photoelectron spectroscopy and theoretical studies of [Com(pyrene)n]− (m=1,2 and n=1,2) complexes

“…Dunbar 10 and Pozniak and Dunbar 42 generated several different metals reacting with one or more coronene molecules. Duncan and co-workers reported photodissociation studies for positively charged metal-coronene systems, 3,[7][8][9]13,14,44 Nb-, Fe-, and Ca-pyrene systems, 13,44,45 and metal-corannulene complexes, 4 as well as the photoelectron spectroscopic studies ͑with Nakajima͒ for V-and Ti-coronene cluster anions. 11 Fe-PAH complexes were studied theoretically by Senapati et al, 61 Wang et al, 50 and Simon and Joblin.…”

Photoelectron spectroscopic study of iron-pyrene cluster anions

“…Many experimental and theoretical studies have provided information regarding the interactions between various transition metals and organic ligands, such as benzene, pyridine, 22 fullerene (C 60 ), 6,15,[23][24][25][26][27][28][29][30][31] coronene, 15,[32][33][34][35][36][37][38][39][40][41][42] cyclooctatetrene (COT), 6,43,44 and pyrene. 37,45,46,49 Most of these studies have focused on characterizing the bonding between the d-electrons in the subject transition metals and the πelectrons of the organic ligands. Since the per atom magnetic moments of transition metal clusters are often larger than those exhibited by the same metal in its condensed state, 47 organic ligands may be able to help some metal clusters retain their high per atom magnetic moments, and this could lead to the synthesis of novel magnetic materials.…”

“…Pyrene is a polyaromatic hydrocarbon which is larger than benzene but smaller than coronene. Previously, Duncan and co-workers 37,39,46 reported photodissociation studies on positively charged Nb-pyrene, Fe-pyrene, and Capyrene complexes. Recently, a joint experimental and theoretical study was reported by the current authors focusing on the geometrical and electronic structures as well as the magnetic properties of Co m (Pyrene) n clusters.…”

Direct Aqueous Self-Assembly of an Amphiphilic Diblock Copolymer toward Multistimuli-Responsive Fluorescent Anisotropic Micelles

“…The self-assembly of this amphiphilic copolymer in water can result in nanoparticles with anisotropic structutre according to our previous researches, [46][47][48][49][50] and the nanoparticles will be fluorescent due to incorporation of the pyrene group. Importantly, an addition of Fe 3+ can induce morphological change of FAMs accompanied by "switch off" of fluorescence due to damage of pyrene π-π stacking and potential interaction of Fe 3+ -pyrene, 51 FAMs were obtained by directly adding the copolymer into water, annealing at 90 °C, and ageing at 25 °C. At room temperature, the white aqueous suspension of FAMs was quite stable and emitted intensely aqua fluorescence as exposed under 365 nm UV light ( Figure 1a).…”

“…We infer that "switch off" of aqua fluorescence could be attributed to a specific complexation of Fe 3+ and polycyclic aromatic pyrene accompanying with the disruption of π-π stacking of pyrene moieties, similarly the gas-phase cation complexes of iron and pyrene. 51,52 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 complexes performed by a reduction of Fe 3+ to Fe 2+ in the presence of DTT, and then the reconstruction of π-π stacking of pyrene moieties by reassembly of copolymer for establishing new hydrophilic-hydrophobic balance. Importantly, when adding fresh Fe 3+ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 3...…”