Dissection of Different Donor Abilities Within Bis(pyrazolyl)pyridinylmethane Transition Metal Complexes

作者：Hoffmann Alexander; Herres Pawlis Sonja^*

来源：Zeitschrift fur Anorganische und Allgemeine Chemie, 2013, 639(8-9): 1426-1432.

DOI：10.1002/zaac.201300103

• N donor ligands
• Iron
• Cobalt
• Copper
• Zinc

Using the bis(pyrazolyl)pyridinylmethane ligand a,a,a-bis(1-pyrazolyl)(2-pyridinyl)toluene {(ph)C(pz)(2)(py)} for bioinorganic inspired coordination chemistry studies, we synthesised and structurally characterised three monofacial complexes [{(ph)C(pz)(2)(py)}CoCl2] (C1), [{(ph) C(pz)(2)(py)}CuCl2] (C2), [{(ph)C(pz)(2)(py)}ZnCl2] (C3) and the binuclear halogenido-bridged complexes [{(ph)C(pz)(2)(py)}(2)(mu-Cl)(2)Fe2Cl2] (C4) and [{(ph)C(pz)(2)(py)}(2)(mu-Br)(2)Cu2Br2] (C5). In four of these complexes, severe disorders between pyrazolyl and pyridinyl donor groups are observed such that bis(pyrazolyl) and (pyrazolyl)(pyridinyl) coordination modes are concomitantly found. The donor competition is dissected by DFT calculation of the energy differences between the two coordination modes and NBO analysis of the donor situation. The pyrazolyl units provide with more donor strength although pyridine is considerably more basic.

• 出版日期2013-7