Article ; Online: Homoleptic 1-D iron selenolate complexes-synthesis, structure, magnetic and thermal behaviour of (1)(∞)[Fe(SeR)2] (R=Ph, Mes).
Dalton transactions (Cambridge, England : 2003)
2011 Volume 40, Issue 26, Page(s) 7022–7032
Abstract: ... both prepared by reaction of [Fe(N(SiMe(3))(2))(2)] with two equivalents of HSeR (R = Ph, Mes) while (1)(∞)[Fe ...
| Abstract | The first examples of polymeric homoleptic iron chalcogenolato complexes (1)(∞)[Fe(SePh)(2)] and (1)(∞)[Fe(SeMes)(2)] (Ph = phenyl = C(6)H(5), Mes = mesityl = C(6)H(2)-2,4,6-(CH(3))(3)) have been both prepared by reaction of [Fe(N(SiMe(3))(2))(2)] with two equivalents of HSeR (R = Ph, Mes) while (1)(∞)[Fe(SePh)(2)] was found to be also easily accessible through reactions of either FeCl(2), Fe(OOCCH(3))(2) or FeCl(3) with PhSeSiMe(3) in THF. In the crystal, the two compounds form one-dimensional chains with bridging selenolate ligands comprising distinctly different Fe-Se-Fe bridging angles, namely 71.15-72.57° in (1)(∞)[Fe(SePh)(2)] and 91.80° in (1)(∞)[Fe(SeMes)(2)]. Magnetic measurements supported by DFT calculations reveal that this geometrical change has a pronounced influence on the antiferromagnetic exchange interactions of the unpaired electrons along the chains in the two different compounds with a calculated magnetic exchange coupling constant of J = -137 cm(-1) in (1)(∞)[Fe(SePh)(2)] and J = -20 cm(-1) in (1)(∞)[Fe(SeMes)(2)]. In addition we were able to show that the ring molecule [Fe(SePh)(2)](12) which is a structural isomer of (1)(∞)[Fe(SePh)(2)] behaves magnetically similar to the latter one. Investigations by powder XRD reveal that the ring molecule is only a metastable intermediate which converts in THF completely to form (1)(∞)[Fe(SePh)(2)]. Thermal gravimetric analysis of (1)(∞)[Fe(SePh)(2)] under vacuum conditions shows that the compound is thermally labile and already starts to decompose above 30 °C in a two step process under cleavage of SePh(2) to finally form at 250 °C tetragonal PbO-type FeSe. The reaction of (1)(∞)[Fe(SePh)(2)] with the Lewis base 1,10-phenanthroline yielded, depending on the conditions, the octahedral monomeric complexes [Fe(SePh)(2)(1,10-phen)(2)] and [Fe(1,10-phen)(3)][Fe(SePh)(4)]. |
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| MeSH term(s) | Iron/chemistry ; Magnetics ; Models, Molecular ; Molecular Conformation ; Optical Phenomena ; Organometallic Compounds/chemical synthesis ; Organometallic Compounds/chemistry ; Selenium/chemistry ; Temperature ; X-Ray Diffraction |
| Chemical Substances | Organometallic Compounds ; Iron (E1UOL152H7) ; Selenium (H6241UJ22B) |
| Language | English |
| Publishing date | 2011-07-14 |
| Publishing country | England |
| Document type | Journal Article |
| ZDB-ID | 1472887-4 |
| ISSN | 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226 |
| ISSN (online) | 1477-9234 ; 1364-5447 |
| ISSN | 0300-9246 ; 1477-9226 |
| DOI | 10.1039/c1dt10089k |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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