Molecular structure of bis[dichloro(N,N,N',N'-tetramethylenediaminecopper(II)], [Cu(tmen)Cl2]2

Ferromagnetic coupling in a unique Cu(II) metallacyclophane with functionalized diazamesocyclic ligands formed by Cu(II)-directed self-assembly: magneto-structural correlations for dichloro-bridged Cu(II) dinuclear complexes

“…For 1, however, the d value is zero, increasing the antiferromagnetic component in the global ferromagnetic coupling. From the magnetic parameters of several such Cu II dimers (type I), [23][24][25][26][27][28][30][31][32][33][34][35] as listed in Table 2, we can also see that the magnetic coupling is, as expected, relatively small (either ferro-or antiferromagnetic) due to the near orthogonality of the magnetic orbitals as illustrated in Scheme 1(b).…”

Dinitrato(N,N,N',N'-tetramethylethylenediamine)copper(II)

“…We are investigating this feature and have previously reported our findings for [Cu(tmen)(OH)]2(C104) 2 as a four-coordinate dimer (Arcus, Fivizzani & Pavkovic, 1977), and also for [Cu(tmen)SO4(H20)2]H20 as a hydrated fivecoordinate monomer (Balvich, Fivizzani, Pavkovic & Brown, 1976). The conformation of the diamine ligand in these two complexes is significantly less twisted about the ethylene C atoms than found in other tmen complexes of known structure (Mitchell, Bernard & Wasson, 1970;Estes, Estes, Hatfield & Hodgson, 1975;Luukkonen & Pajunen, 1973). In the search for additional examples containing this reduced-twist conformation, the structure determination of the anhydrous complex Cu(tmen)(NO3)2 was undertaken.…”

Análise térmica aplicada ao estudo de materiais energéticos

“…Este parâmetro de avaliação foi o adotado no trabalho de Ostmark et al 29 que avaliou a estabilidade do explosivo FOX-12 a partir da energia de ativação (E a ) obtida pelas curvas DSC e TG. O resultado encontrado igual a 277 kJ/mol, quando comparado ao RDX 30 que apresenta um valor de 201 kJ/mol, permitiu aos autores concluir que o FOX-12 é mais estável termicamente.…”