605686-50-8Relevant academic research and scientific papers
Serendipitous Isolation of the First Example of a Mixed-Valence Samarium Tripyrrole Complex
Berube, Christian D.,Yazdanbakhsh, Mohammad,Gambarotta, Sandro,Yap, Glenn P.A.
, p. 3742 - 3747 (2003)
The transamination reaction of Sm{N(SiMe3)2} 2(THF)2 with two dipyrrole ligands of formula RR′C(α-C4H3NH)2 (R = R′ = Et; R = Me, R′ = Ph) has been examined. The reactions in THF and under N2 gave two similar tetranuclear dinitrogen complexes, {[Et 2C(α-C4H3N)2Sm} 4(THF)2](μ-N2)·2THF and [{[(C 6H5)(CH3)C(α-C4H 3N)2]Sm}4(DME)2]μ-N2), where the dinitrogen unit has undergone a four-electron reduction via cooperative attack of four divalent samarium atoms and remained coordinated both side-on and end-on between the four coplanar metal centers. The same reaction carried out with diethyldipyrrolylmethane under an argon atmosphere afforded the divalent samarium macrocyclic cluster {[Et 2C(α-C4H3N)2]Sm} 8(THF)4·4THF. In the case of the reaction with the methylphenyldipyrrolylmethane ligand under N2, the unprecedented hexanuclear mixed-valence SmII/SmIII cluster [([(C 6H5)(CH3)C(α-C4H 3N)2][(C6H5)(CH 3)C(α-C4H3N)(??-C4H 3N)]{[(C6H5)(CH3)C] 2(α-C4H3N) 2(α,α′-C4H2N)}Sm 3)(THF)3]2, containing tripyrrolide, N-confused , and regular dipyrrolide ligands was serendipitously formed by reaction with the impurities contained in the nonpurified ligand.
