Synthesis and structural characterization of lanthanum and cerium substituted cyclopentadienyl borohydride complexes

Add time:08/09/2019    Source:sciencedirect.com

The lanthanide borohydrides [Ln(BH4)3(THF)n] [Ln = La, n = 4 (1); Ln = Ce, n = 3.5] were treated with the substituted cyclopentadienyl potassium transfer agents KCptt (Cptt = C5H3tBu2-1,3), KCpttt (Cpttt = C5H2tBu3-1,2,4) and KCp′′′ (Cp′′′ = C5H2(SiMe3)3-1,2,4) in various reaction conditions to yield the heteroleptic lanthanide complexes [La(Cptt)2(μ-BH4)]2 (2), [La(Cpttt)(BH4)2(THF)2] (3), [La(Cpttt)(μ-BH4)2]6 (4), [Ce(Cpttt)(BH4)(μ-BH4)(THF)]2 (5), [La(Cpttt)2(BH4)] (6) and [Ln(Cp)2(BH4)(THF)] (Ln = La, 7; Ce, 8) by salt metathesis protocols. Complexes 1–8 have been variously characterized by single crystal X-ray diffraction, multi-nuclear NMR and FTIR spectroscopies, and elemental analyses.

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