Abstract
The addition of the N–H bond of the formamidine, ArN(H)C=NAr (Ar = C6H3Pr 2 i -2,6), to the gallium(I) center of [K(tmeda)][:Ga(Ar-DAB)] (Ar-DAB={(Ar)NC(H)}2) yields K[(Ar-DAB)GaIII(H){N(Ar)C=NAr}] 1. The crystal structure of this and two other related anionic compounds, [K(18-crown-6)][(Ar-DAB)GaIII{N(H)N=Fl}{(H)Fl}] (Fl = fluorendiyl) 2 and [K(OEt2)3][(Ar-DAB)GaII(CH2Ph)GaII(Ar-DAB)] 3, have been determined. The cell parameters of the compounds are 1: P21/c, a = 20.2350(9), b = 14.1760(7), c = 19.6441(10), β = 111.307(1); 2: P21/c, a = 13.115(3), b = 21.799(4), c = 22.646(5), β = 90.20(3); 3: P21/n, a = 16.783(3), b = 21.635(4), c = 19.814(4), β = 92.34(3). The crystal structures of all complexes exhibit distorted tetrahedral gallium centers, and interactions between anion aryl substituents and the potassium cations. The crystal structures of three anionic gallium(II or III) heterocyclic compounds, derived from oxidation reactions of a gallium(I) heterocycle salt, [K(tmeda)][:Ga(Ar-DAB)] (Ar-DAB = {(C6H3Pr 2 i -2,6)NC(H)}2), are reported.
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