Heterometallic Compounds with the Binuclear Complex Anion [Cr2(OH)(Ac)(Nta)2]~(2-): Synthesis and Structure

摘要

Heterometallic compounds BaCr2(OH)(Ac)(Nta)2·4H2O (I) and [Fe(L)3][Cr2(OH)(Ac)(Nta)2]· nH2O (L is Bipy (II) and Phen (III); Bipy is α,α'-bipyridine, Phen is o,o'-phenanthroline, Ac~- is acetate ion, Nta is nitrilotriacetate ion; n = 8 (II) and 6.25 (III)) are synthesized. According to the X-ray diffraction data, compounds II and III have ionic structures built of the isolated complex cations [Fe(L)3]~(2+), binuclear complex anions [Cr2(OH)(Ac)(Nta)2]~(2-), and crystallization water molecules. The magnetic properties of compounds II and III in the interval from 2 to 300 K confirm assumptions on the diamagnetic character of [Fe(L)3]~(2+) and indicate the antiferromagnetic interaction between the chromium atoms in the dimeric fragment [Cr2(OH)(Ac)(Nta)2]~(2-).