Abstract
Reaction of anhydrous Cu(hfac)2 (hfacH = 1,1,1,5,5,5-hexafluoro-2,4-pentanedione) with 2-(diisopropylamino)ethanol yields two different binuclear copper(II) complexes. Compound 1, [Cu(hfac)2(μ-OCH2CH2NH(i-Pr)2)]2, Cu2C36H42O10N2F24, consists of centrosymmetric dimers containing two cis-Cu(hfac)2 moieties that are bridged by two zwitterionic 2-(diisopropylammonio)ethoxide ions. Cell parameters are a = 11.6516(13); b = 14.0117(17); c = 15.3258(17) A β = 105.75(9)° in space group P21/n. The copper ions exhibit tetragonally distorted octahedral coordination, with two of the Cu—O(hfac) distances showing characteristic elongation (2.2858(16) and 2.3192(17) A). Compound 2, [Cu(hfac)((i-Pr)2NCH2CH2O)]2, Cu2C26H38O6N2F12, also contains centrosymmetric dimers; these are formed by two square-pyramidal moieties joined at their bases. Cell parameters are a = 7.7353(5); b = 13.6166(17); c = 15.683(2) A β = 98.23(1)° in space group P21/n. In this structure the apical Cu—O(hfac) distance is elongated (2.254(4) A), and the O atoms of the 2-(diisopropylamino)ethoxide ions are bridging.
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