Synthesis and Properties of New Molecule-Based Magnets Containing Mn(II), Cu(II) and Nitronyl Nitroxide Radical Cation
نویسندگان
چکیده
Neste trabalho, descrevemos a obtenção de dois novos compostos de cobre(II), ou precursores, (Pr-Rad) 2 [Cu(opba)].H 2 O (1) e (Bu-Rad) 2 [Cu(opba)].2H 2 O (2), onde opba é o ligante ortofenilenobis(oxamato) e R-Rad são radicais cátions do tipo nitronil nitróxido. A partir destes compostos 1 e 2, foram sintetizados os dois novos magnetos moleculares [Pr-Rad] 2 [Mn 2 {Cu(opba)} 3 ].3,3 DMSO.5H 2 O (3) e [Bu-Rad] 2 [Mn 2 {Cu(opba)} 3 ].3DMSO.6H 2 O (4), respectivamente. As propriedades magnéticas dos precursores 1 e 2 mostram a presença de interações ferromagnéticas entre os radicais cátions e o cobre (II), na faixa de temperatura entre 20 e 300 K. Os magnetos moleculares 3 e 4 exibem magnetização espontânea com temperatura crítica, T c , de 23 K e 24 K, respectivamente.
منابع مشابه
Synthesis, crystal structures and magnetic behaviour of four coordination compounds constructed with a phosphinic amide-TEMPO radical and [M(hfac)2] (M = Cu(II), Co(II) and Mn(II)).
In the present work we describe the synthesis, crystal structures and magnetic properties of four coordination compounds obtained by assembling a new phosphinic amide containing the TEMPO moiety, 1-piperidinyloxy-4-[(diphenylphosphinyl)amino]-2,2,6,6-tetramethyl radical (dppnTEMPO), with [M(hfac)2] building blocks (M = Cu(II), Co(II), Mn(II)). The crystal structures of the coordination compound...
متن کاملDiazidobis[4,4,5,5-tetramethyl-2-(1,3-thiazol-2-yl)-2-imidazoline-1-oxyl-3-oxide-κ2 O,N]manganese(II)
In the crystal structure of the title compound, [Mn(N(3))(2)(C(10)H(14)N(3)O(2)S)(2)], the Mn(II) atom exhibits a roughly octa-hedral coordination geometry. The Mn(II) atom lies on an inversion centre, thus the asymmetric unit comprises one half-mol-ecule. The metal center is six-coordinated by two azide anions and by two chelating 4,4,5,5-tetra-methyl-2-(1,3-thia-zol-2-yl)-2-imidazoline-1-oxyl...
متن کاملA New Method for the Synthesis of Heterospin Complexes
The interaction of binuclear Co(II) pivalate [Сo2(H2O)Piv4(HPiv)4] with nitronyl nitroxide HL1 (2-(2-hydroxy-5-nitrophenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole3-oxide-1-oxyl) in organic solvents led to the formation of a pentanuclear heterospin complex [Co5(Piv)4L14L22]. A nontrivial peculiarity of the complex is the presence of both the starting nitronyl nitroxide L1 and its deoxygena...
متن کاملSynthesis, Characterization and Theoretical Studies of a New Macroacyclic Schiff-Base Ligand Containing Piperazine Moiety and Related Mn(II), Cu(II), Ni(II) and Cd(II) Complexes
Four new [NiH2L](ClO4)2 (1), [CuH2L](ClO4)2 (2), [MnH2L](ClO4)2 (3) and [CdH2L](ClO4)2 (4), complexes were prepared by the reaction of a new Schiff base ligand and Cu(II), Ni(II), Mn (II) and Zn (II) metal ions in equemolar ratios. The ligand, H2L was synthesized by reaction of 1, 4- bis (2- formylphenyl) piperazine and ethanol amine and characterized with IR and 1H,13C NMR spectroscopy. All co...
متن کاملCopper(II) coordination compounds with sterically constraining pyrenyl nitronyl nitroxide and imino nitroxide
2-(10-Pyrenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl (PyrNN) and 2-(10-pyrenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-1-oxyl (PyrIN) form pentacoordinate metal–radical complexes with Cu(hfac)2: [Cu(hfac)2PyrNN] and [Cu(hfac)2PyrIN], 1 and 2, respectively. In 1, one aminoxyl unit of PyrNN coordinates to Cu(II) in a distorted square pyramidal environment. In 2, an unu...
متن کامل