Isolation and Characterization of Linear Polymeric {[1,1-H₁₀C₆(α-C₄H₃N)₂]₂Sm[Na(THF)]₂}n: A 30-Electron Species with a (η⁵-Cp)₄Ln Type Structure

Reduction of the tetranuclear dinitrogen cluster {[1,1-H 10 C 6 (α-C 4 H 3 N) 2 ]Sm} 4 (THF) 2 (μ-N 2 ) with Na sand in THF afforded the linear polymeric divalent Sm complex {[1,1-H 10 C 6 (α-C 4 H 3 N) 2 ] 2 Sm[Na(THF)] 2 } n, where each samarium atom is surrounded by four η 5 -bonded pyrrolide rings, thus giving the metal center a formal 30-electron configuration.