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Updated: Nov 26, 2025

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
Published on: March 20, 2017
Isolable 1-Butene Copper(I) Complexes and 1-Butene/Butane Separation Using Structurally Adaptable Copper Pyrazolates
Ahmed H Elashkar1, Devaborniny Parasar2, Alvaro Muñoz-Castro3
1Department of Chemical and Process Engineering, University of Canterbury, Christchurch, 8140, New Zealand.
Abstract:
Non-porous small molecule adsorbents such as {[3,5-(CF3 )2 Pz]Cu}3 (where Pz=pyrazolate) are an emerging class of materials that display attractive features for ethene-ethane separation. This work examines the chemistry of fluorinated copper(I) pyrazolates {[3,5-(CF3 )2 Pz]Cu}3 and {[4-Br-3,5-(CF3 )2 Pz]Cu}3 with much larger 1-butene in both solution and solid state, and reports the isolation of rare 1-butene complexes of copper(I), {[3,5-(CF3 )2 Pz]Cu(H2 C=CHC2 H5 )}2 and {[4-Br-3,5-(CF3 )2 Pz]Cu(H2 C=CHC2 H5 )}2 and their structural, spectroscopic, and computational data. The copper-butene adduct formation in solution involves olefin-induced structural transformation of trinuclear copper(I) pyrazolates to dinuclear mixed-ligand systems. Remarkably, larger 1-butene is able to penetrate the dense solid material and to coordinate with copper(I) ions at high molar occupancy. A comparison to analogous ethene and propene complexes of copper(I) is also provided.
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