Synthesis and characterization of amine complexes of the cyclopentadienyliron dicarbonyl complex cation, [Cp(CO)2Fe] |
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| Authors: | Cyprian M M’thiruaine Evans O Changamu |
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| Institution: | a School of Chemistry, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa
b Chemistry Department, Kenyatta University, P.O. Box 43844, Nairobi, Kenya |
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| Abstract: | The organometallic Lewis acid, CpFe(CO)2]+ (Cp = η5-C5H5) reacts with excess dry diethyl ether at low temperatures to form the labile complex CpFe(CO)2(Et2O)]+BF4]− (1) which is stable at low temperatures and has been fully characterized. Complex 1 in turn reacts with 1-aminoalkanes and α,ω-diaminoalkanes to form new complexes of the type CpFe(CO)2NH2(CH2)nCH3]BF4 (n = 2-6) (2) and {CpFe(CO)2}2μ-(NH2(CH2)nNH2)](BF4)2 (n = 2-4) (3), respectively. These complexes have been fully characterized and the mass spectral patterns of complexes 2 are reported. The structures of compounds 2a (n = 2) and 2b (n = 3) have been confirmed by single crystal X-ray crystallography. The single crystal X-ray diffraction data show that complex 2a, CpFe(CO)2NH2(CH2)2CH3]BF4, crystallizes in a triclinic  space group while 2b, CpFe(CO)2NH2(CH2)3CH3]BF4, crystallizes in an orthorhombic Pca21 space group with two crystallographically independent molecular cations in the asymmetric unit. Furthermore, the reaction of 1 with 1-alkenes gives the η2-alkene complexes in high yield. |
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| Keywords: | α ω-Diaminoalkanes Diethyl ether complex 1-Aminoalkanes Cyclopentadienyliron dicarbonyl |
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