Synthesis, Structure, And Magnetic Properties Of A Family Of Mn(Ii) Compounds With Substituted 2-Aminopyridinium Ions

A family of complexes were made by combining MnX2 center dot nH(2)O (X = Cl, Br) with 2-amino-3-methylpyridine (3MAP), 2-amino-5-methylpyridine (5MAP) or 2-amino-5-iodopyridine (5IAP) in aqueous acidic conditions. The resulting complexes were (3MAPH)(2)Cl-2 center dot MnCl2(H2O) 2 (1), (3MAPH)(2)Br-2 center dot MnBr2(H2O)(2) (2), (5IAPH)(8)[Mn4Cl10(H2O)(8)]Cl-6 (3) and (5MAPH)(2) MnBr4 (4). Complexes 1-3 crystalize in monoclinic space groups (1 = P2(1/c), 2&3 = P2(1/n)) with chains formed by halide bridged manganese ions. Compound 4 crystalizes in the triclinic space group P-1 with a manganese halide ladder structure formed via short Br...Br contacts. Complexes 1, 2 and 4 were studied through variable temperature magnetic susceptibility measurements, all of which exhibited weak antiferromagnetic interactions (J = similar to - 0.45 to -0.05 K). (C) 2021 Elsevier Ltd. All rights reserved.