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Direct\u2010current magnetic data, single\u2010crystal torque magnetometry, and EPR measurements disclosed the easy\u2010axis nature of this cobalt(II) complex, which shows single\u2010molecule magnet behavior when a static field is applied in alternating\u2010current susceptibility measurements. Diamagnetic dilution in the zinc(II) analogue [Zn(bpp\u2010COOMe)<jats:sub>2<\/jats:sub>](ClO<jats:sub>4<\/jats:sub>)<jats:sub>2<\/jats:sub>\u2005(<jats:bold>2<\/jats:bold>) afforded the derivative [Zn<jats:sub>0.95<\/jats:sub>Co<jats:sub>0.05<\/jats:sub>(bpp\u2010COOMe)<jats:sub>2<\/jats:sub>](ClO<jats:sub>4<\/jats:sub>)<jats:sub>2<\/jats:sub>\u2005(<jats:bold>3<\/jats:bold>), which exhibits slow relaxation of magnetization even in zero field thanks to the reduction of dipolar interactions. Theoretical calculations confirmed the overall electronic structure and the magnetic scenario of the compound as drawn by experimental data, thus confirming the spin\u2010phonon Raman relaxation mechanism, and a direct quantum tunneling in the ground state as the most plausible relaxation pathway in zero field.<\/jats:p>","DOI":"10.1002\/chem.201801026","type":"journal-article","created":{"date-parts":[[2018,4,14]],"date-time":"2018-04-14T19:27:00Z","timestamp":1523734020000},"page":"8857-8868","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":79,"title":["A Pseudo\u2010Octahedral Cobalt(II) Complex with Bispyrazolylpyridine Ligands Acting as a Zero\u2010Field Single\u2010Molecule Magnet with Easy Axis Anisotropy"],"prefix":"10.1002","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9875-9765","authenticated-orcid":false,"given":"Luca","family":"Rigamonti","sequence":"first","affiliation":[{"name":"Dipartimento di Scienze Chimiche e Geologiche Universit\u00e0 degli Studi di Modena e Reggio Emilia and INSTM RU of Modena and Reggio Emilia  via G. 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