25327-03-1Relevant articles and documents
X-Ray Diffraction Studies on the Structure of the Tri- and Tetrathiocyanatomanganate(II) Complexes and Solvated Lithium Ion in N,N-Dimethylformamide
Radnai, Tamas,Ishiguro, Shin-ichi,Ohtaki, Hitoshi
, p. 1445 - 1452 (1992)
The structure of the tri- and tetrathiocyanato-N-manganate(II) complexes in N,N-dimethylformamide (DMF) solution was determined by the solution X-ray diffraction method at 25 deg C.The most probable structure of the tricomplex is octahedral with additiona
Synthesis, X-ray powder diffraction study, thermal analysis, Hirshfeld surface analysis and optical properties of new crystalline polymer: {(C2H10N2)(MnCl(NCS)2)2}n
Chouaib, Hassen,Kamoun, Slaheddine,Karoui, Sahel
, (2021)
Synthesis, structural and optical properties are given for a new organic manganese pseudo halide material. The crystal structure has been solved by ab initio using direct methods from powder data and has been confirmed by additional single-crystal data collected with a CCD area detector. The structure of the {(C2H10N2)(MnCl(NCS)2)2}n reveals that the adjacent Mn(II) centres are bridged by a pair of SCN? anions to form a 1-D array giving rise to the anionic chains (MnCl(NCS)2)nn?. These chains are themselves interconnected by means of N–H???Cl(S) hydrogen bonds originating from the organic cation [(NH3)2(CH2)2]2+. Optical parameters, such as extinction coefficient, refractive index, permittivity refractive, optical conductivity, electrical conductivity and electrical susceptibility were studied using the absorbance spectra UV-vis spectrophotometer in the spectral range 200-800 nm. Atomic Mulliken charges, energies of frontier molecular orbitals (EHOMO and ELUMO), energy band gap (EHOMO–ELUMO), chemical hardness (η), global electrophilicity index(ω) and Electronegativity (χ) were calculated by Density functional theory (DFT) using B3LYP method. The direct optical band gap energy deduced from the UV–VIS spectroscopy is Eg= 3.61 eV.
Syntheses, crystal structures and antibacterial activities of two new Mn(II) complexes based on triaryltriazoles
Zhang, Shi-Pei,Feng, Zhe,Wu, Bin,Jiang, Jing-Jing,Zhu, Dun-Ru,He, Bingfang
, p. 46 - 56 (2018)
Two new Mn(II) complexes, trans-[Mn(L1-L2)2(NCS)2] (1–2) with triaryltriazole (1, L1?=?3-(p-bromophenyl)-4-phenyl-5-(2-pyridyl)-1,2,4-triazole; 2, L2?=?3,4-bis(p-methylphenyl)-5-(2-pyridyl)-1,2,4-triazole), have been synthesized and structurally characterized by elemental analysis, FT-IR, ESI-MS, and single-crystal X-ray crystallography. Crystallographic studies revealed that both 1 and 2 contain a distorted octahedral [MnN6] core with two trans-disposed NCS? ions. The L1 ligand, 1 and 2, together with four known homologous Mn(II) complexes, trans-[Mn(L3-L6)2(NCS)2] (3–6) (3, L3?=?3-(p-methoxyphenyl)-4-(p-chlorophenyl)-5-(2-pyridyl)-1,2,4-triazole; 4, L4?=?3-(p-methoxyphenyl)-4-(p-bromophenyl)-5-(2-pyridyl)-1,2,4-triazole; 5, L5?=?3-(p-chlorophenyl)-4-(p-methylphenyl)-5-(2-pyridyl)-1,2,4-triazole; 6, L6?=?3,5-bis(2-pyridyl)-4-(p-methylphenyl)-1,2,4-triazole), were tested in vitro for their antibacterial activities against two Gram-positive bacterial strains and two Gram-negative bacterial strains by the MTT method. The results indicate that 1 exhibited better activity than Penicillin and Kanamycin against Pseudomonas aeruginosa and also better than its free L1 ligand.
Investigations on the influence of the metal center coordination on the magnetic properties of Mn thiocyanato coordination polymers
Suckert, Stefan,W?hlert, Susanne,N?ther, Christian
, p. 96 - 102 (2015)
Reaction of manganese(II) thiocyanate with the monodentate ligand 4-benzylpyridine (bp) leads to the formation of two compounds of composition Mn(NCS)2(4-benzylpyridine)4 (1-bp) and Mn(NCS)2(4-benzylpyridine)2 (2-bp). Compound 1-bp forms discrete complexes in which the Mn cations are coordinated by four 4-benzylpyridine ligands and two terminal N-bonding thiocyanato anions within slightly distorted octahedra. In compound 2-bp the metal cations are surrounded by two cis-coordinating 4-benzylpyridine ligands, two cis-coordinating S-bonded thiocyanato anions and two trans-coordinating N-bonded anionic ligands. The Mn cations are linked into zig-zag-like chains by pairs of μ-1,3-bridging anionic ligands. DTA-TG measurements on 1-bp prove that 2-bp is obtained as intermediate. Magnetic measurements on the chain compound 2-bp show dominating antiferromagnetic interactions between the Mn centers. On cooling a maximum is observed in the susceptibility curve indicative for an antiferromagnetic transition. The results of the magnetic measurements are compared with those obtained for other Mn thiocyanato chain compounds in which the thiocyanato anions are trans-coordinated.
Formation of di- and polynuclear Mn(II) thiocyanate pyrazole complexes in solution and in the solid state
Jochim, Aleksej,N?ther, Christian
, p. 793 - 801 (2018)
Reaction of Mn(NCS)2 with pyrazole leads to the formation of three compounds with the compositions Mn(NCS)2(pyrazole)4 (1), [Mn(NCS)2]2(pyrazole)6 (2) and Mn(NCS)2(pyrazole)
Coordination-driven self-assembly of a series of dinuclear M2L2mesocates with a bis-bidentate pyridylimine ligand
Chainok, Kittipong,Dungkaew, Winya,Jiajaroen, Suwadee,Jittirattanakun, Siripak,Kielar, Filip,Puangsing, Praifon,Rungtaweevoranit, Bunyarat,Saphu, Watcharin,Sukwattanasinitt, Mongkol,Theppitak, Chatphorn
, p. 7736 - 7743 (2021/06/16)
Four isostructural dinuclear M2L2mesocates of the general formula [M2(NCS)4(L)2]·4.5MeOH (1M; M = Mn, Fe, Co, Zn) were constructed by using the coordination-driven self-assembly of the [M(NCS)2] precursor and the flexible bis-bidentate pyridylimine Schiff base ligand L (L = 4,4′-(1,4-phenylenebis(oxy))bis(N-(pyridin-2-ylmethylene)aniline). The centrosymmetric M2L2mesocate forms through the side-by-side coordination of two L ligands to a pair of M(ii) ions. The mesocates exhibit a reversible temperature induced desolvation-solvation behavior without losing their structural integrity. The activated1Co, as the representative M2L2mesocate, shows an exceptionally high MeOH vapour uptake capacity of 481.9 cm3g?1(68.8 wt%) at STP with good recyclability. Notably, it also exhibits CO2adsorption with an uptake capacity of 20.2 cm3g?1(3.6 wt%) at room temperature and 1 bar.
Strengthening the Magnetic Interactions in Pseudobinary First-Row Transition Metal Thiocyanates, M(NCS)2
Bassey, Euan N.,Cliffe, Matthew J.,Da Silva, Ivan,Dutton, Sian E.,Grey, Clare P.,Keyzer, Evan N.,Lee, Jeongjae,Manuel, Pascal,Paddison, Joseph A. M.
supporting information, p. 11627 - 11639 (2020/09/09)
Understanding the effect of chemical composition on the strength of magnetic interactions is key to the design of magnets with high operating temperatures. The magnetic divalent first-row transition metal (TM) thiocyanates are a class of chemically simple layered molecular frameworks. Here, we report two new members of the family, manganese(II) thiocyanate, Mn(NCS)2, and iron(II) thiocyanate, Fe(NCS)2. Using magnetic susceptibility measurements on these materials and on cobalt(II) thiocyanate and nickel(II) thiocyanate, Co(NCS)2 and Ni(NCS)2, respectively, we identify significantly stronger net antiferromagnetic interactions between the earlier TM ions-a decrease in the Weiss constant, θ, from 29 K for Ni(NCS)2 to-115 K for Mn(NCS)2-a consequence of more diffuse 3d orbitals, increased orbital overlap, and increasing numbers of unpaired t2g electrons. We elucidate the magnetic structures of these materials: Mn(NCS)2, Fe(NCS)2, and Co(NCS)2 order into the same antiferromagnetic commensurate ground state, while Ni(NCS)2 adopts a ground state structure consisting of ferromagnetically ordered layers stacked antiferromagnetically. We show that significantly stronger exchange interactions can be realized in these thiocyanate frameworks by using earlier TMs.
