Synthesis, structural and magnetic study of two new alternating 1D azido-bridged cobalt(II) complexes

One-Dimensional Cadmium Polymers with Alternative di(EO/EE) and di(EO/EO/EO/EE) Bridged Azide Bonding Modes

“…Cadmium(II)–pseudohalides, specifically Cd(II)–N 3 , are of particular interest not only in the synthesis of polynuclear ,− and polymeric compounds with different dimestionality, − but also in their ability to affect the emission wavelength. ,,− Some of these compounds produced interesting structures with different alternative bonding modes of azide bridges (structure VI in Scheme ). − Similar structures were reported in azido-Cu(II) and -Ni(II) complexes, which were derived from sterically hindered coligands. − , As a d 10 metal ion, the Cd(II) ion in certain complexes can enhance or quench the fluorescence emission of the organic ligand. , The fluorescence’s enhancement in the Cd(II)–azido complexes is more interesting from the photochemical applications point of view. The photoinduced electron transfer (PET) process results from the excitation of the lone-pairs of electrons, which are located in the donor atoms of the ligand.…”

“…The potential affinity of this small ion to act as a bridging linker and to assemble metal ions in 1-, 2-, or 3-D extended polymeric networks has led to the isolation of a number of coordination compounds with interesting molecular and crystalline architectures. − In addition to this, the bridged azide anion serves as an excellent effective ligand to propagate the magnetic interaction between the paramagnetic centers where magnetic superexchange mechanism is known to occur through various modes. − All these properties made this ligand an attractive target for extensive studies. Thus, aside from the terminal mondentate nature of the azido ligand, many bridging coordination modes such as single- and double-bridges μ 1,3 -N 3 (end-to-end, EE), − μ 1,1 -N 3 (end-on, EO), − ,− and (μ 1,3 -N 3 )/(μ 1,1 -N 3 ) (EE/EO), triple-bridges , μ 1,1,3 -N 3 and μ 1,1,1 -N 3 , quarterly bridges − μ 1,1,1,1 -N 3 and μ 1,1,2,2 -N 3 , and hexa-bridges μ 1,1,1,3,3,3 -N 3 were also reported. ,− Alternative μ 1,3 -N 3 and μ 1,1 -N 3 bridges were also found in some systems. ,,,,,, Scheme summarizes only the different modes of mono and doubly bridged azide as assembled by two metal ions in dinuclear and/or in polynuclear species. The type and the topological features of the resulting coordination complexes depend largely on the nature of the coordinated coligands and the steric environment imposed by these ligands, and to some extent on the nature of the central metal ion, its oxidation state and coordination number as well as on the geometry of the complex. ,, …”

Synthesis, crystal structure, and characterization of two new end-to-end 1D pseudohalide bridged manganese(III) complexes

“…Schiff base, a remarkable group of organic molecules, has appeared as a commonly used chelating ligand for the formation of transition metal complexes [1][2][3][4][5][6][7]. For their fascinating properties in building competent catalysts [8][9][10][11], promising magnetic materials [12][13][14][15], vital pharmaceuticals[16], optoelectronic gadgets [17], bio-mimetic homolog [18] and so on, the newly produced Schiff bases and their complex compounds show considerable dedication to the research community [19][20][21][22][23][24] .…”

Azido-bridging cobalt(II) systems: crystal structures and magnetic properties

“…Compared to azido complexes of Cu(II), Ni(II) or Mn(II), the number of reported polynuclear Co(II) azido complexes is relative small, mainly caused by synthetic problems to obtain good quality single crystals. Following our work in this field we report a comparative magneto-structural study of a series of azido-bridged Co(II) complexes with N-donor containing co-ligands, mainly pyridine derivative ligands [2][3][4][5][6][7]…”