[Pb{Mn(CO)5}3][AlCl4]: a lead-manganese carbonyl with AlCl4-linked PbMn3 clusters

Abstract

[Pb{Mn(CO)₅}₃][AlCl₄] containing a trigonal planar PbMn₃ cluster was obtained by the reaction of PbCl₂ and Mn₂(CO)₁₀ in the ionic liquid [BMIm][AlCl₄]. The title compound is composed of [Pb{Mn(CO)₅}₃]⁺ carbonyl cations and [AlCl₄]⁻ anions that are connected to infinite zig-zag chains. The [Pb{Mn(CO)₅}₃]⁺ cation exhibits a central PbMn₃ cluster with three equal Pb–Mn single bonds, resulting in an almost equilateral triangle of three manganese atoms with a formal Pb^+I in its center. Such a cluster and compound were identified for the first time. In addition to single-crystal structure analysis, the composition, structure and properties were further characterized by density functional theory (DFT) calculations, energy dispersive X-ray spectroscopy (EDXS), and Fourier-transform infrared spectroscopy (FT-IR), as well as optical spectroscopy (UV-Vis).