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A series of isomorphous three-dimensional metal-organic frameworks [Co II  1- x  Zn II   x  (L)(N 3 )]·H 2 O ( x = 0.26, 0.56 and 0.85) based on bimetallic Co II  1- x  Zn II   x  ( x = 0.26, 0.56 and 0.85) chains with random metal sites have been synthesized and magnetically characterized. The Co II  1- x  Zn II   x  series, which intrinsically feature random anisotropic/diamagnetic sites, shows complex magnetic interactions. By gradually introducing the diamagnetic Zn II ions into the pure anisotropic Co II single-chain magnets system, the ferromagnetic interactions between Co II ions are gradually diluted. Moreover, the slow magnetic relaxation behaviour of the mixed metal Co II  1- x  Zn II   x  systems also changes. In this bimetallic series Co II  1- x  Zn II   x  , the Co-rich materials exhibit slow relaxation processes that may arise from SCM mechanism, while the Zn II -rich materials show significantly low slow magnetic relaxation. A general trend is that the activation energy and the blocking temperature decrease with the increase in diamagnetic Zn II content, emphasizing the importance of anisotropy for slow relaxation of magnetization.

rsc advances

Mixed metal CoII1−xZnIIx–organic frameworks based on chains with mixed carboxylate and azide bridges: magnetic coupling and slow relaxation