No abstract

Three-dimensional highly connected isonicotinic acid−base metal−organic frameworks (MOFs), [Co II 6 (μ 3 -OH) 2 (in) 7 (HCOO) 3 H 2 O]•4DMF (1) and [Mn II 3 (μ 3 -OH)-(in) 3 (CH 3 COO) 2 ] (2) (Hin = isonicotinic acid), have been successfully prepared. Compounds 1 and 2 were constructed from planar Co 6 cluster SBUs or rare 1D manganese-hydroxyl chain SBUs, respectively. Both SBUs contain triangular M II 3 (OH) (M = Co and Mn) central units, which are connected by rare syn,anti,syn,anti-and syn,syn,anti-coordinated formic acid or acetic acid. Both compounds 1 and 2 have good thermal stability, while compound 2 also exhibits an extraordinarily high moisture stability. Magnetic studies demonstrate that 1 shows antiferromagnetic behavior, and 2 exhibits spin-canting antiferromagnetic ordering with soft-magnetic behavior.