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Solubilities of the perchlorate salt of the iron(II) complex of the tripodal ligand derived from tris(2-aminoethyl)amine and pyridine 2-carboxaldehyde, [Fe(fpyHg 3 tren)](ClO 4 ) 2 , have been determined in MeOH-, i-PrOH-, t-BuOH-, and DMSO-H 2 O mixtures. Solubilities of [Fe(fpyMeg 3 tren)](ClO 4 ) 2 and of [Fe(fpyPhg 3 tren)](ClO 4 ) 2 , analogues derived from 2-acetylpyridine and 2-benzoylpyridine, respectively, have been determined in MeOH-H 2 O mixtures. Transfer chemical potentials for the three complexes have been calculated from these solubilities, and solvation trends for these complexes discussed in relation to the overall pattern for iron(II)-diimine complexes in binary aqueous solvent mixtures. The crystal structure of [Fe(fpyHg 3 tren)](ClO 4 ) 2 has been determined.

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