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Updated: May 21, 2025

Synthesis of a Water-soluble Metal–Organic Complex Array
Published on: October 8, 2016
Synthesis of triple-decker sandwich compounds featuring a M-M bond through cyclo-Bi5 and cyclo-Sb5 rings
Yu-He Xu1, Xing Yang2, Ya-Nan Yang1
1State Key Laboratory of Elemento-Organic Chemistry, Tianjin Key Lab of Rare Earth Materials and Applications, School of Material Science and Engineering, Nankai University, Tianjin, China.
Abstract:
The cyclopentadienyl anion is a π-aromatic five-membered ring ligand that is widely used in organometallic chemistry. By replacing the CH groups in cyclopentadiene with isoelectronic group-15 elements, an inorganic analogue can be obtained. In this line, Pn5 (Pn = P, Sb) rings have been stabilized in a triple-decker sandwich structure, prepared via high-temperature reactions, and an example of a Bi5- ring stabilized in a cobalt-based inverse-sandwich-type complex has been reported. Here we report the synthesis and structural characterization of two complexes, [Cp-V(cyclo-Sb5)V-Cp]2- and [Cp-Nb(cyclo-Bi5)Nb-Cp]2-, which are stabilized by [K(18-crown-6)]+ or [K(2.2.2-crypt)]+ cations at room temperature under mild conditions. Our bonding analysis through various quantum-chemical methods reveals that V‒V and Nb‒Nb bonds pass through the centre of the E5 rings (E = Sb, Nb). In contrast to free cyclo-E5 (E = Sb, Bi) the cyclo-E5 moieties between Cp-E units do not possess any aromatic character because the M‒M (M = V, Nb) bond passes through the centre of the ring.
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