First-row transition metal complexes of the hexadentate macrocycle 1,4,7-tris(5-tert-butyl-2-hydroxybenzyl)-1,4,7-triazacyclononane (LH3). Crystal structures of [LTiIV]BPh4, [LCrIII], [LFeIII], and [(LH)2FeIII2](ClO4)2.2H2O

The new hexadentate macrocycle containing three phenolate pendant arms has been prepared from 1,4,7-triazacyclononane and 3 equiv of 2-bromomethyl-4-tert-butylphenyl acetate: Tripotassium 1,4,7-tris(5-tert-butyl-2-hydroxybenzyl)-1,4,7-triazacyclononanate (K 3 L; C 39 H 54 N 3 O 3 K 3 ). The reaction of trivalent first-row transition metals with the trianion affords monomeric pseudooctahedral complexes.