DIG3tren is a four coordinate tripodal ligand that forms complexes with transition metal ions, including Co2+. The M(DIG3tren)2+ complex can bind to an auxiliary ligand by forming a coordination bond from the metal and by providing hydrogen bond donors from the DIG3tren arms. Co(DIG3tren)[BPh4]2 is a previously reported complex that was reacted with NBu4X salts in isopropanol to replace one of the tetraphenylborate counter ions with an auxiliary ligand (X=F, Cl, Br), yielding [Co(DIG3tren)X]BPh4. The different cobalt complexes of DIG3tren with different halides as auxiliary ligand were successfully synthesized and their structures determined by X-ray crystallography. The ESI MS of the [Co(DIG3tren)X]BPh4 complexes, UV-vis spectra in different solvents and hydrogen bonding lengths and angles obtained from X ray crystallography are used to compare the strength of different halide anion binding with the cobalt DIG3tren complex.

Syntheses and structural comparison of [Co(DIG3tren)X]BPh4 complexes (X = halide)

255th National Meeting (2018)

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