155857-86-6Relevant articles and documents
Instant Detection of Hydrogen Cyanide Gas and Cyanide Salts in Solid Matrices and Water by using CuII and NiII Complexes of Intramolecularly Hydrogen Bonded Zwitterions
Nair, Ratish R.,Raju,Jana, Kalyanashis,Mondal, Dhrubajyoti,Suresh,Ganguly, Bishwajit,Chatterjee, Pabitra B.
, p. 10721 - 10731 (2018)
A series of intramolecularly hydrogen-bonded zwitterionic compartmental ligands HL1–HL4, containing a pendent diamine arm that is monoprotonated and an aldehyde functionality at two different ortho-positions of a 4-halophenoxide, is reported herein. Single-crystal X-ray diffraction (SXRD) provides persuasive evidence for the identification of this class of proton-transferred zwitterions at room temperature. The solid-state photoluminescent nature of these zwitterions remains intact in aqueous and organic solutions. Grinding of HL1 and HL2 with Cu2+/Ni2+ salts develop turn-on probes 1–4. Compounds 1 and 4 are dinuclear CuII and NiII species, respectively. Compound 2 is a tetranuclear CuII complex. Interestingly, compound 3 is a mononuclear NiII species in which both nitrogen atoms in the pendant diamine arm are protonated and, therefore, not coordinated to the NiII center. All these probes (1–4) display an instant response to the poison gas hydrogen cyanide (HCN) and cyanide salts present in both solid matrices and aqueous (100 % water) solution. Selective and rapid sensing of HCN gas and cyanide salts in solid/soil/water phases, without any interference, by the mechanosynthesized complexes 1–4 can be perceived easily by the naked eye under a hand-held UV lamp.
Dinuclear Manganese(II) Complexes of Unsymmetric Phenol-based Dinucleating Ligands with Amino and Imino Chelating Arms: Synthesis, Structure and Catalase-like Activity
Higuchi, Chikako,Sakiyama, Hiroshi,Okawa, Hisashi,Isobe, Ryuichi,Fenton, David E.
, p. 1097 - 1104 (1994)
Unsymmetric phenol-based dinucleating ligands with amino and imino chelating arms, 4-bromo-2-methyl>-6-phenolate(1-) 1) or ethyl (L2)>, formed dinuclear manganese(II) complexes (L = L1 or L2, R = Me or Ph).The complex 2(MeCO2)2(NCS)> crystallizes in the monoclinic space group P21/n, a = 13.450(2), b = 18.743(3), c = 12.662(2) Angstroem and β = 102.08(1) deg.An X-ray diffraction analysis revealed that the dinuclear core structure is bridged by the phenolic oxygen of L2 and by two acetate groups.The unsymmetric ligand provides different co-ordination geometries about the two manganese ions.The geometry of Mn at the imine site is distorted trigonal bipyramidal with the imine N and the two acetate O atoms in the basal plane and the phenolic O and the terminal N at the axial sites.The geometry of the Mn at the amine site is distorted octahedral involving also the nitrogen of the isothiocyanato group.Magnetic susceptibility measurements over the temperature range 4.2-300 K indicated weak antiferromagnetic interaction (J = -3 to -5 cm-1 based on = -2JS1*S2).Cyclic voltammetry for 1(MeCO2)2(NCS)> in CH2Cl2 revealed three quasi-reversible redox couples (E1/2 = 0.63, 1.07 and 1.24 V vs. saturated calomel electrode) assignable to the stepwise oxidations Mn(II)Mn(II) --> Mn(II),Mn(III) --> Mn(III)Mn(III) --> Mn(III)Mn(IV).All the complexes show a catalase-like activity, disproportionating H2O2 into O2 and H2O.The presence of oxomanganese(IV) intermediates is suggested based on visible and mass spectrometric investigations.
Hydrolysis of β-lactam antibiotics catalyzed by dinuclear zinc(II) complexes: Functional mimics of metallo-β-lactamases
Kaminskaia, Natalia V.,Spingler, Bernhard,Lippard, Stephen J.
, p. 6411 - 6422 (2007/10/03)
Three stable dinuclear zinc(II) complexes, [Zn2L1(μ-NO3)(NO3)2] and [Zn2L1(μ-OMe)(NO3)2], where L1 is 2,6-bis{[N-(2- dimethylaminoethyl)-N-methyl
