A salt-like compound containing the cation [Tris(1,10-phenanthroline)manganese (II)](2+) and the anion 3,3-commo-bis[eta~5-1,2-dicarba-(3)-cobalt(III) -closo-dodecaborate](1-),[Mn~(II) (1,10-C_(12)H_8N_2)_3]~(2+) {Co~(III)[eta~5-(3)-1,2-B_9C_2H-(11)]

摘要

In this paper,the results of a comparative study of a salt-like paramagnetic Mn(II) (d~5) complex [Mn~(II)(1,10-C_(12)H_8N_2)_3]~(2+)[Co~(III)(B_9C_2H_(11)]_2~- (I) against [Mn~(II)(1,10-C_(12)H_8N_2)_2(NCS)_2]~0 (II) and [Mn~(II)(1,10-C_(12)H_8N_2)_3]~(2+)[B_9C_2H_(12)]_2~- (III) are presented.Complexes I and III were synthesized by precipitating the Mn(II) cations with the corresponding anions in the stoichiometric ratio at a pH of approx 4.5 and were studied by X-ray diffraction analysis on single crystals;by IR ,Raman,and EPR spectroscopy;and using magnetochemical methods.The structures and crystal-chemical parameters of I at 190 and 293 K are identical.The crystals are monoclinic;space group P2_1.Two crystallographic types of the [Co(B_9C_2H_(11)_2]~- cluster ligands.The short contacts C-H~delta…~delta-H-B between different-type hydrogen atoms show themselves in the IR spectra.The apparent magnetic moments of the Mn(II) atom in I,II,and III at 293 K correspond to mu=5.86 mu_B and do not depend on its ligand or anion environment.The temperature dependences mu=f(T) pass through a maximum at about 20K,which suggests the occurrence of ferromagnetic exchange interactions in complexes I and III,which both contain clustain cluster carborane derivatives with three-dimensional aromaticity.