57638-78-5Relevant academic research and scientific papers
Ligand-directed assembly of trinuclear and one-dimensional heterotrimetallic CuIILnIIIFeIII complexes: Unusual antiferromagnetic CuIIFeIII coupling: Via cyano bridges
Liu, Mei-Jiao,Hu, Kong-Qiu,Liu, Cai-Ming,Cui, Ai-Li,Kou, Hui-Zhong
, p. 8643 - 8649 (2016)
New heterotrimetallic complexes [Cu(valpn)(H2O)Ln(H2O)3Fe(CN)6]·xH2O (Ln = Gd, x = 3 for complex 1; Ln = Tb, x = 3 for complex 2; Ln = Dy, x = 1.75 for complex 3; H2valpn = N,N′-bis(3-methoxysalicylidene)-1,3-diaminopropane), {[Cu(Me2valpn)]2Ln(H2O)Fe(CN)6·xH2O·yCH3CN}n (Ln = Gd, x = 5, y = 2.5 for complex 4; Ln = Tb, x = 4.5, y = 1.5 for complex 5; Ln = Dy, x = 5.5, y = 2.5 for complex 6; Ln = Y, x = 6, y = 4 for complex 7; H2Me2valpn = N,N′-bis(3-methoxysalicylidene)-2,2-dimethyl-1,3-diaminopropane) have been synthesised by a reaction of Cu(valpn) (or Cu(Me2valpn)), Ln3+ and [Fe(CN)6]3- in a molar ratio of 2:1:1. Complexes 1-3 have a CuLnFe trinuclear structure, consisting of phenoxo-bridged Cu-Ln and cyano-bridged Ln-Fe moieties. Complexes 4-7 contain phenoxo-bridged Cu2Ln units that are connected by [Fe(CN)6]3- to form a one-dimensional (1D) zig-zag structure. In the trinuclear complexes 1-3, the [Fe(CN)6]3- anion coordinates to Ln3+, whereas it coordinates to Cu2+ in complexes 4-7. Magnetic studies demonstrate that there exists a ferromagnetic interaction between Cu(ii) and Gd(iii) ions via the phenoxo bridges, while the cyano-bridges transit antiferromagnetic coupling between low-spin Fe(iii) and Cu(ii) or Gd(iii). The fitting to the magnetic susceptibilities of complexes 1 and 4 gave the parameters of JCuGd = 2.392 and 2.945 cm-1, and JFeGd = -0.341 cm-1 and JFeCu = -0.378 cm-1. The ac magnetic measurements reveal that complex 6 shows slow magnetization relaxation with an energy barrier of 12.3 K and a relaxation time of τ0 = 1.65 × 10-6 s, which is typical of a single-chain magnet.
A New Co-ordinating Role for a Metal Salicylaldimine
Cunningham, Desmond,Gallagher, John F.,Higgins, Tim,McArdle, Patrick,McGinley, John,Sheerin, David
, p. 959 - 961 (1990)
Air oxidation of 2>(Cu2I4), the cation of which contains the nickel salicylaldimine molecules co-ordinated in a novel fashion to 22+.
Supramolecular rectangles and ladders constructed from Ni(II), Cu(II) and Zn(II) mononuclear complexes with bicompartmental ligands and 4-aminopyridine as tectons
Madalan, Augustin M.,Ene, Cristian D.
, p. 184 - 192 (2017/10/05)
By reacting [MII(valpn)] or [MII(valdmpn)] mononuclear complexes with 4-aminopyridine in different molar ratios, five [MII(valXpn)(4-NH2-py)] and one [NiII(valdmpn)(4-NH2-py)2] complexes were obtained and structurally characterized (MII = NiII, CuII, ZnII; valpnH2 and valdmpnH2 are the Schiff bases resulted from the condensation of o-vanillin with 1,3-propylenediamine and 2,2-dimethyl-1,3-propylenediamine respectively). In the [Cu(valpn)(4-NH2-py)], [Ni(valpn)(4-NH2-py)], [Zn(valpn)(4-NH2-py)] and [Ni(valdmpn)(4-NH2-py)] complexes the metal ions are pentacoordinated with a square pyramidal geometry. The specific hydrogen bond interactions of the amino group belonging to the 4-aminopyridine with the free O2O′2 compartment of the Schiff base ligands led to various supramolecular architectures: rectangles, chains, and ladders. The spectroscopic properties of the compounds were also investigated.
