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The coordination number of the gadolinium atom and bond distances in the crystal of inonomeric porphyrinate,[Gd(TPP)acac-8H2O 3TCB] (TCB: 1,2,4-trichlorobenzene,acac: anion of acetylacetone),were determined by EXAFS method.The Gd atom is eight-coordinated to the four nitrogen atoms of a tetraphenylporphyrin ring,to the two oxygen atoms of one acetylacetonato anion and to two water molecules with Gd-N=0.232 nm,Gd-O=0.243 nm.