title: Single-Step Synthesis of Organometallic Molecular Squares from NR,NR',NR'',NR'''-Substituted Benzobiscarbenes.
abstract: The single-step multicomponent self-assembly of molecular squares featuring four bridging benzobiscarbenes and four PdII(allyl) or IrI(COD) vertices is presented. Four equivalents of the linear benzobisimidazolium salt [1](PF6)2react with two equivalents of [Pd(allyl)Cl]2or [IrCl(COD)]2in the presence of Cs2CO3to yield the tetranuclear octacarbene molecular squares [2](PF6)4(M=Pd) and [3](PF6)4(M=Ir), respectively. Compounds [2](PF6)4and [3](PF6)4feature exclusively M-carbon bonds making them the first purely organometallic molecular squares.
authors: Institut für Anorganische und Analytische Chemie and NRW Graduate School of Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, 48149, Münster, Germany.
authors: Narayan
authors: N
authors: Sinha
authors: Institut für Anorganische und Analytische Chemie and NRW Graduate School of Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, 48149, Münster, Germany.
authors: Florian
authors: F
authors: Roelfes
authors: Institut für Anorganische und Analytische Chemie and NRW Graduate School of Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, 48149, Münster, Germany.
authors: Alexander
authors: A
authors: Hepp
authors: Institut für Anorganische und Analytische Chemie and NRW Graduate School of Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, 48149, Münster, Germany.
authors: F Ekkehardt
authors: FE
authors: Hahn
keywords: carbene ligands; molecular squares; self-assembly; supramolecular chemistry; transition metals