Abstract
AbstractThe assembly of CuII, MII (CoII or NiII), azido, and isonicotinate acid N‐oxide under hydrothermal conditions straightforwardly gives two isomorphic heterometallic 3d–3d azido complexes formulated [Cu2M(N3)4(INO)2(H2O)4]∞ (INO = isonicotinate N‐oxide; M = Co for 1 and Ni for 2). In the structure of the complexes, CuII ions have a trigonal‐bipyramidal‐coordinated configuration, whereas the MII ions have octahedral geometry with two water molecules in the apical positions. The structure of the complexes is based on azido‐carboxylate mixed‐coordination Cu–M–Cu trimers, which are further linked by double end‐on (EO) azido anions through the CuII ions to form a chain structure, and the 1D structure can be described as EO azido/syn–syn carboxylates and double EO azido mixed‐bridge spin‐sequence chains with –1/2–J1–3/2–J1–1/2–J2–1/2– for 1 and –1/2–J1–1–J1–1/2–J2–1/2– for 2. Magnetic studies indicated that 1 and 2 are both metamagnets for the weak antiferromagnetic interactions between the ferromagnetic chains.
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