Change search
ReferencesLink to record
Permanent link

Direct link
Mono- and binuclear complexes of iron(II) and iron(III) with an N4O ligand: synthesis, structures and catalytic properties in alkane oxidation
Show others and affiliations
2006 (English)In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, no 20, 2427-2434 p.Article in journal (Refereed) Published
Abstract [en]

Three mononuclear iron complexes and one binuclear iron complex, [Fe(tpoen)Cl]center dot 0.5(Fe2OCl6) (1), [Fe(tpoen)Cl]PF6 (2), Fe(tpoen)Cl-3 (3) and [{Fe(tpoen)}(2)(mu-O)](ClO4)(4) (4) (tpoen = N-(2-pyridylmethoxyethyl)-N,N-bis(2-pyridylmethyl)amine), were synthesized as functional models of non-heme iron oxygenases. Crystallographic studies revealed that the Fe(II) center of 1 is in a pseudooctahedral environment with a pentadentate N4O ligand and a chloride ion trans to the oxygen atom. The Fe(III) center of 3 is ligated by three nitrogen atoms of tpoen and three chloride ions in a facial configuration. Each Fe(III) center of 4 is coordinated with four nitrogen atoms and an oxygen atom of tpoen with the Fe-O-Fe angle of 172.0(3) angstrom. Complexes 2, 3 and 4 catalysed the oxidation of cyclohexane with H2O2 in the total TNs of 24 - 36 with A/K ratios of 1.9-2.4. Under the same conditions they also catalysed both the oxidation of ethylbenzene to benzylic alcohol and acetobenzene with good activity (30-47 TN) and low selectivity (A/K 0.7), and the oxidation of adamantane with moderate activity (15-18 TN) and low regioselectivity (3 degrees/2 degrees 3.0-3.2). With mCPBA as oxidant the catalytic activities of 2, 3 and 4 increased 1.8 to 2.3-fold for the oxidation of cyclohexane and ethylbenzene and 6.3 to 7.5-fold for the oxidation of adamantane. Drastic enhancement of the regioselectivity was observed in the oxidation of adamantane (3 degrees/2 degrees 18.5-30.3).

Place, publisher, year, edition, pages
2006. no 20, 2427-2434 p.
Keyword [en]
spectroscopic characterization, pentadentate ligand, nitrogen ligands, nonheme, hydroxylation, models, fe(ii), h2o2, intermediate, acetonitrile
URN: urn:nbn:se:kth:diva-15675DOI: 10.1039/b516697gISI: 000237577600005ScopusID: 2-s2.0-33744932172OAI: diva2:333717
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus
In the same journal
Dalton Transactions

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 13 hits
ReferencesLink to record
Permanent link

Direct link