Pentanuclear pivalate Ni(II) and Co(II) clusters: modulation of molecular structures and magnetic properties

trans-Bis(acetonitrile-κN)tetraaquacobalt(II) tetrachloridocobaltate(II)

“…For background to our studies on new helical metal complexes, see: Stefankiewicz et al (2008). There are only few examples of other bis(acetonitrile)tetraaqua complexes, these are mainly cobalt complexes: bis(4,7-phenantroline) diperchlorate (Beauchamp & Loeb, 2002), dinitrate (Kopylovich et al, 2001; Barnett et al, 2002), dichloride monohydrate (Malkov et al, 2003) and dibromide (Depree et al, 2000), and one nickel complex, dibromide, has been reported (Assoumatine & Stoeckli-Evans, 2001). All these compounds have 1:2 composition.…”

New manganese (II) 2d-polymer with deprotonated hydroxytetrazine bridges

“…Of particular interest seem to be compounds of high spin 3d metal atoms with large ground spin states. Their magnetic properties have been the focus of intense research efforts [2][3][4][5][6].In this paper, the reactions of Mn(II) (S = 5/2) pivalate polymer [Mn(OOCCMe 3 ) 2 (EtOH)] n (1) [8] with potential ligand 3-hydroxy-6-(3,5-dimethylpyrazol-1-yl)-1,2,4,5-tetrazine (2) are discussed.Polynuclear pivalate cobalt (II) and nickel (II) species have been recently shown to react with bis[3,5-(dimethylpyrazolyl)]-1,2,4,5-tetrazine (3) in inert or air atmosphere resulting in pentanuclear pivalate complexes M 5 (l 3 -OH) 2 (l-OOCCMe 3 ) 4 (l-N,N 0 ,N 00 -3,5-Me 2 C 3 HN 2 C 2 (O)N 4 ) 4 (MeCN) 2 (M = Ni, Co) [6]. The formation of pentanuclear clusters obviously includes hydrolytic splitting of the initial dipyrazolyltetrazine 3 (see…”

“…Of particular interest seem to be compounds of high spin 3d metal atoms with large ground spin states. Their magnetic properties have been the focus of intense research efforts [2][3][4][5][6].…”

“…The 3d-metal alkanoates have been proved to react with multifunctional heterocyclic organyls serving as linkers to form nanosized oligomeric and polymeric compounds [2][3][4][5][6]. Both self-assembly processes and physical properties of the resulting products constitute an important area of modern coordination chemistry [1,7].…”

“…Polynuclear pivalate cobalt (II) and nickel (II) species have been recently shown to react with bis[3,5-(dimethylpyrazolyl)]-1,2,4,5-tetrazine (3) in inert or air atmosphere resulting in pentanuclear pivalate complexes M 5 (l 3 -OH) 2 (l-OOCCMe 3 ) 4 (l-N,N 0 ,N 00 -3,5-Me 2 C 3 HN 2 C 2 (O)N 4 ) 4 (MeCN) 2 (M = Ni, Co) [6]. The formation of pentanuclear clusters obviously includes hydrolytic splitting of the initial dipyrazolyltetrazine 3 (see 1387 Eq.…”