N-Donor-Functionalized Acetylacetones for Heterobimetallic Coordination Polymers, the Next Episode: Trimethylpyrazoles

The ditopic molecule 3-(1,3,5-trimethyl-4-1H-pyrazolyl)acetylacetone (HacacMePz) combines an acetylacetone group suitable for deprotonation and O,O? coordination to a Pearson hard cation with softer N-donor site. Both binding modes were employed individually: the pyrazolyl moiety was coordinated ZnII, HgII, AgI, trivalent iron tris-chelating complex [Fe(acacMePz)3] isolated. CuII derivative shows shorter chelation N in more distant Jahn–Teller sites exists two alternative crystal forms: namely, as tetranuclear discrete chain polymer. different hardnesses of acacMePz– allow design well-ordered mixed-metal solids. Selective complexation soft cations achieved polymers combining FeIII HgII or AgI. Even slight differences hardness based on oxidation states same imply sufficient selectivity, shown by successful synthesis mixed-valence CuII/CuI A synopsis all structurally characterized compounds confirms that HacacMePz represents bridging ligand restricted conformational freedom. No full rotation about single bond between fragments occurs, dihedral angles these moieties are limited values 90 ± 17°.