TY - JOUR
T1 - Synthesis and structure of Fe4(CO)10(μ2-CO)(μ4-Te) 2 and 57Fe Mössbauer spectra of Fe3(CO)9(μ3-Te)2 and Fe4(CO)10(μ2-CO)(μ4-Te) 2
AU - Fässler, Thomas F.
AU - Vögl, Thomas
AU - Fabritchnyi, Pavel B.
AU - Afanasov, Mikhail I.
N1 - Funding Information:
This work was funded by a grant from the Swiss National Science Foundation. We are grateful to Professor R. Nesper, ETH Zürich, for his generous support and to Professor J. Rouxel, Institut des Materiaux de Nantes, for the interest in this work.
PY - 1998/6/30
Y1 - 1998/6/30
N2 - The compound Fe4(CO)10(μ2-CO)(μ4-Te) 2 (1) has been prepared by the reaction of Fe3(CO)9Te2 (2) and Fe2(CO)9 in toluene. Compound 1 is also formed by UV light irradiation of 2 and Fe(CO)5 in THF. The structure of 1 was established by single-crystal analysis. Crystal data: orthorhombic, Pccn, a=6.843(1), b=15.814(1), c=17.436(1) Å; V=1887 Å3; Z=4; T=293 K, R1=0.040. 1 consists of a planar array of four iron atoms with a quadruply bridging telluro ligand on each side of the plane. The shortest metal-metal bond contains a bridging carbonyl ligand, semi-bridging carbonyl ligands bridge the two adjacent metal-metal bonds. 125Te-NMR investigations show a conversion from 1 to 2 within several hours. 57Fe Mössbauer spectra show two doublets for 1 and only one broadened doublet for 2. The ratio of the intensities of the doublets of 1 is found close to unity and confirms the existence of two equipopulated crystallographic sites of iron. On the contrary, in the case of 2, the analysis of the spectra does not allow the expected correlation with the results of the crystal structure determination. The same difficulty was previously encountered in the case of the isostructural selenide Fe3(CO)9Se2.
AB - The compound Fe4(CO)10(μ2-CO)(μ4-Te) 2 (1) has been prepared by the reaction of Fe3(CO)9Te2 (2) and Fe2(CO)9 in toluene. Compound 1 is also formed by UV light irradiation of 2 and Fe(CO)5 in THF. The structure of 1 was established by single-crystal analysis. Crystal data: orthorhombic, Pccn, a=6.843(1), b=15.814(1), c=17.436(1) Å; V=1887 Å3; Z=4; T=293 K, R1=0.040. 1 consists of a planar array of four iron atoms with a quadruply bridging telluro ligand on each side of the plane. The shortest metal-metal bond contains a bridging carbonyl ligand, semi-bridging carbonyl ligands bridge the two adjacent metal-metal bonds. 125Te-NMR investigations show a conversion from 1 to 2 within several hours. 57Fe Mössbauer spectra show two doublets for 1 and only one broadened doublet for 2. The ratio of the intensities of the doublets of 1 is found close to unity and confirms the existence of two equipopulated crystallographic sites of iron. On the contrary, in the case of 2, the analysis of the spectra does not allow the expected correlation with the results of the crystal structure determination. The same difficulty was previously encountered in the case of the isostructural selenide Fe3(CO)9Se2.
KW - Iron
KW - Mössbauer spectroscopy
KW - Tellurium
UR - http://www.scopus.com/inward/record.url?scp=0001043266&partnerID=8YFLogxK
U2 - 10.1016/S0022-328X(98)00558-0
DO - 10.1016/S0022-328X(98)00558-0
M3 - Article
AN - SCOPUS:0001043266
SN - 0022-328X
VL - 561
SP - 221
EP - 225
JO - Journal of Organometallic Chemistry
JF - Journal of Organometallic Chemistry
IS - 1-2
ER -