Abstract
The title compound, Ga(tpp)(OAc), crystallizes in the space group P21/n witha=10.628(2),b=16.176(2),c=20.750(2), A, β=92.64(2)°, andZ=4. The gallium atom has a squarepyramidal coordination geometry formed by the four nitrogen atoms of the porphyrinato group (Np) and the acetate ion. The geometry around the gallium center of the Ga(tpp)(OAc) molecule has Ga−O(1)=1.874(4) A and average Ga−Np(porphyrin nitrogen)=2.056(4) A. The acetate group is unidentately coordinated to the gallium (III) atom. Ga-71 NMR spectroscopy provides a complementary method for investigation of the acetate ligand. Combining the calculated value of τc, 29.0 ps, with the measured Ga-71 quadrupolar relaxation time, T1Q=11.1 μs, the quadrupole coupling constant of Ga-71 is 28.1 MHz. This further supports that Ga is covalently coordinated to the acetate and tpp in Ga(tpp)(OAc). The methyl and carbonyl carbons of the acetate group are separately located at 20.4 and 168.8 ppm at 24°C for the Ga(tpp)(OAc).
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