Cyanide vs. azide "magnetic arm wrestling": MnII-NbIV and MnII-MoIV magnetic coordination polymers with mixed bridging

Gabriela Handzlik; Marcin Kozieł; Anna Olejniczak; Barbara Sieklucka; Dawid Pinkowicz

doi:10.1039/c7cc05319c

Cyanide vs. azide "magnetic arm wrestling": Mn^II-Nb^IV and Mn^II-Mo^IV magnetic coordination polymers with mixed bridging

Chem Commun (Camb). 2017 Aug 29;53(70):9753-9756. doi: 10.1039/c7cc05319c.

Authors

Gabriela Handzlik¹, Marcin Kozieł, Anna Olejniczak, Barbara Sieklucka, Dawid Pinkowicz

Affiliation

¹ Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland. dawid.pinkowicz@uj.edu.pl.

PMID: 28812753
DOI: 10.1039/c7cc05319c

Abstract

Two magnetic coordination polymers with mixed cyanide-azide bridging based on octacyanoniobate(iv) and octacyanomolybdate(iv) are reported: {(NH₄)[(H₂O)Mn^II-(μ-N₃)-Mn^II(H₂O)][M^IV(CN)₈]·3H₂O}_n Mn₂MN₃ (M = Nb or Mo). Cyanide ligands form the 3-D framework of Mn₂MN₃, while azide ligands connect two Mn^II centres together. Both CN^- and N₃^- are known in magnetochemistry for their marked magnetic coupling abilities which in the case of Mn2NbN3 lead to competitive antiferromagnetic interactions within the Nb^IV-CN-Mn^II and Mn^II-N₃-Mn^II structural motifs. This competition results in a peculiar magnetic behaviour consistent with a non-collinear magnetic structure.