Proton-Coupled Electron-Transfer Reactions in [MnIV2(.mu.-O)3L'2]2+ (L' = 1,4,7-Trimethyl- 1,4,7-triazacyclononane)

Hage, Ronald; Krijnen, Bert; Warnaar, Johann B.; Hartl, František; Stufkens, Derk J.; Snoeck, Theo L.

doi:10.1021/ic00124a010

Cited by 54 publications

(35 citation statements)

References 4 publications

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“…IR (KBr, per cm): 2978, 2935, 2841, 1457 (-CH 3 , -CH 2 -); 841, 556 (PF 6 ); 664 (Mn-O-Mn). The characteristic absorption bands were in agreement with the results in the literature [25,29]. Elemental analysis found for C 18 H 42 O 3 N 6 Mn 2 P 2 F 12 (calc.…”

Section: Analysis and Characterisation Of Binuclear Manganese Complexsupporting

confidence: 90%

Low‐temperature bleaching of cotton fabric with a binuclear manganese complex of 1,4,7‐trimethyl‐1,4,7‐triazacyclononane as catalyst for hydrogen peroxide

Qin

Song

et al. 2012

Coloration Technology

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Bleaching of cellulose fabric with hydrogen peroxide is traditionally conducted under alkaline conditions at high temperature, which leads to greater energy consumption and fibre damage. In this study, a binuclear manganese complex of the ligand 1,4,7‐trimethyl‐1,4,7‐triazacyclononane as the catalyst for hydrogen peroxide bleaching was synthesised via a simplified method. Low‐temperature bleaching of cotton fabric with the manganese complex and the effect of key bleaching variables on the bleaching performance were investigated. Hydrogen peroxide could be catalysed to bleach cotton knitted fabric at a temperature as low as 60 °C by incorporating the complex in the bleaching solution. The whiteness index of the fabric bleached at low temperature was lower than that of fabric bleached at high temperature, but the bursting strength retention is much better for the fabric bleached at low temperature. The low temperature is energy‐saving and has environment‐friendly advantages over the traditional high‐temperature method.

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Section: Analysis and Characterisation Of Binuclear Manganese Complexsupporting

confidence: 90%

Low‐temperature bleaching of cotton fabric with a binuclear manganese complex of 1,4,7‐trimethyl‐1,4,7‐triazacyclononane as catalyst for hydrogen peroxide

Qin

Song

et al. 2012

Coloration Technology

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“…Over the last two decades several groups have focused on the use of manganese catalysts based on the ligand N , N′,N′′ ‐trimethyl‐1,4,7‐triazacyclononane (tmtacn) originally developed by Wieghardt and co‐workers in the late 1980s as model systems for the water splitting component of photosystem II (PS II) and dinuclear manganese‐based catalase enzymes 7,8,9,10. The first report on the use of [Mn IV,IV 2 O 3 (tmtacn) 2 ] 2+ ( 1 ) (Figure 1) as a catalyst was by Hage et al.…”

Section: Introductionmentioning

confidence: 99%

Investigation of multi‐walled carbon nanotube‐reinforced high‐density polyethylene/carbon black nanocomposites using electrical, DSC and positron lifetime spectroscopy techniques

Jeevananda

Kim

Lee

et al. 2009

Polymer International

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BACKGROUND: The positive temperature coefficient (PTC) effect on material properties has attracted much attention in recent years due to the prospects of many applications like temperature sensors, thermistors, self‐regulating heaters, etc. It has been suggested that incorporation of multi‐walled carbon nanotubes (MWNTs) into carbon black (CB)‐filled polymers could improve the electrical properties of composites due to high conductivity and network structure and significantly reduce the required CB loading. RESULTS: We observed no change in melting temperature and crystalline transition temperature on addition of MWNTs. However, the heat of fusion decreases as the amount of conducting carboxylated MWNT (c‐MWNT) filler increases and the resistivity of the composite decreases. The free volume shows an increase up to 1.5 wt% of c‐MWNT content and then decreases. CONCLUSION: Well‐developed crystals could not be formed due to restricted chain mobility as filler content increases. This results in minimum intermolecular interactions, and thus a decreased heat of fusion. A composite with c‐MWNT content of 0.5 wt% showed the highest PTC and higher resistivity at 150 °C possibly due to the formation of flocculated structures at elevated temperature. For filler content greater than 1.5 wt%, the decrease in free volume may be due to restricted chain mobility. Copyright © 2009 Society of Chemical Industry

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“…As noted by Hage et al, [53] the one-electron reduction of 18 at -600 mV (vs. SCE) undergoes a shift and becomes an irreversible four-electron reduction at ca. -0.2 V in the presence of carboxylic acids in water.…”

Section: IImentioning

confidence: 62%

“…NMR spectroscopy [52] is, despite the paramagnetic nature of many manganese complexes, also useful in their study because many bi-and multi-nuclear complexes show strong antiferromagnetic interactions, in particular Mn III Mn III and Mn IV Mn IV complexes. [53] In addition, X-ray based techniques, over and above X-ray crystallography, although not yet widely accessible, are having an increased impact in the study of manganese complexes. Indeed, X-ray absorption techniques (e.g., EXAFS, XANES etc.)…”

Section: Mnmentioning

confidence: 99%

“…[105] Application to laundry cleaning was reported in the mid-1990s. [106] Hage et al [53] described the pH dependence of the physical and electronic properties of [Mn , λ exc = 488 nm) Mn-O-Mn vibrational modes in the IR and Raman spectra of 18, respectively, were identified by 18 O-labelling. Protonation resulted in a shift in both bands to 683 cm -1 with an increase in the Mn-O-Mn angle (78°to 81°).…”

Section: IImentioning

confidence: 99%

See 1 more Smart Citation

Redox‐State Dependent Ligand Exchange in Manganese‐Based Oxidation Catalysis

Abdolahzadeh

Böer²,

Browne

2015

Eur J Inorg Chem

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Manganese-based oxidation catalysis plays a central role both in nature, in the oxidation of water in photosystem II (PSII) and the control of reactive oxygen species, as well as in chemical processes, in the oxidation of organic substrates and bleaching applications. The focus of this review is on efforts made to explore and elucidate the redox-dependent coordination chemistry of these manganese-based systems in solution and the mechanisms by which their catalytic redox 3432reactions proceed. We also examine the behaviour and activity of complexes that have been developed and used as models for the active sites of the corresponding enzymes, or used as catalysts in the oxidation of organic substrates. Given the current concern over the environmental and economic impact of chemical processes, manganese catalysts that use H 2 O 2 as oxidant are the primary focus of this review.

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Proton-Coupled Electron-Transfer Reactions in [MnIV2(.mu.-O)3L'2]2+ (L' = 1,4,7-Trimethyl- 1,4,7-triazacyclononane)

Cited by 54 publications

References 4 publications

Low‐temperature bleaching of cotton fabric with a binuclear manganese complex of 1,4,7‐trimethyl‐1,4,7‐triazacyclononane as catalyst for hydrogen peroxide

Low‐temperature bleaching of cotton fabric with a binuclear manganese complex of 1,4,7‐trimethyl‐1,4,7‐triazacyclononane as catalyst for hydrogen peroxide

Investigation of multi‐walled carbon nanotube‐reinforced high‐density polyethylene/carbon black nanocomposites using electrical, DSC and positron lifetime spectroscopy techniques

Redox‐State Dependent Ligand Exchange in Manganese‐Based Oxidation Catalysis

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