1628570-69-3Relevant articles and documents
Chemodosimetric detection of the acetate anion by using the template reaction method via a fluorescence turn-off signal
Das, Sudhanshu,Jana, Sankar,Chakraborty, Prateeti,Sanyal, Ria,Maiti, Dilip Kumar,Guchhait, Nikhil,Zangrando, Ennio,Das, Debasis
, p. 5432 - 5442 (2014)
The compartmental ligand 2,6-bis[2-(N-ethyl)thiopheneiminomethyl]-4-chlorophenol (HL) undergoes Cu(ClO4)2 induced partial hydrolysis to yield a monoamine ligand 4-chloro-2-formyl-6-[2-(thiophen-2-yl)ethyliminomethyl]phenol (HL). On further reaction with Cu(ClO4)2, HL produces a dinuclear complex, [Cu2(L)2(ClO4)2] (2), which has been characterized in solution by UV/Vis, ATR, NMR, and ESI-MS spectral techniques and in the solid state by X-ray single-crystal structure analysis. The in situ generated 2 is highly fluorescent. On reaction with sodium acetate it transforms to a fluorescence inactive tetranuclear species, [Cu4(L)2(OAc)4(O)] (3), and thereby acts as an excellent chemodosimeter for selective detection of the acetate anion via fluorescence turn-off signalling. The direct reaction of HL and copper(II) acetate dihydrate yielded another fluorescence inactive tetranuclear species, [Cu4(L)2(OAc)4(O)] (1), which is a diastereoisomer of 3 as is evident from X-ray single-crystal structural analyses.
Syntheses, characterization, and magneto-structural analyses in μ1,3-acetato-bridged tetracopper(II) and μ1,3- and μ1,1,3-acetato-bridged pentanickel(II) clusters
Das, Sudhanshu,Sorace, Lorenzo,Guha, Averi,Sanyal, Ria,Kara, Hulya,Caneschi, Andrea,Zangrando, Ennio,Das, Debasis
, p. 2753 - 2765 (2014/06/24)
Two pentanuclear NiII complexes, [Ni5(L 1)2(CH3COO)6(OH)2(MeOH) 2] (1) and [Ni5(L2)2(CH 3COO)6(OH)2(H2O)2] (2), and one tetranuclear CuII complex, [Cu4(L 3)2(CH3COO)4(O)] (3), have been synthesized from phenol-based end-off compartmental ligands HL 1 to HL3 {HL1 = 2,6-bis[ethyl(2-thienyl) iminomethyl]-4-tert-butylphenol; HL2 = 2,6-bis[ethyl(2-thienyl) iminomethyl]-4-chlorophenol and HL3 = 2,6-bis[ethyl(2-thienyl) iminomethyl]-4-methylphenol, respectively}. The complexes have been structurally characterized and their magnetic properties have been investigated within the temperature range 2.2-300 K. Complexes 1 and 2 comprise two dinuclear [Ni 2L2] units linked to a central Ni ion by bridging μ3-hydroxo groups. The cluster is stabilized by syn-syn-μ1,3-bridging and μ1,1,3-bridging acetate anions. The structural analysis of 3 revealed two crystallographically independent complexes that consisted of a tetrahedron of CuII ions connected to a central μ4-oxo species and further bridged by four acetate groups along four of the six edges of the Cu4 core. The other two edges are occupied by μ-phenoxo bridges from the deprotonated L 3 ligand. Magnetic investigations revealed both ferromagnetic and antiferromagnetic interactions in 1 and 2 with single-ion zero-field splitting of magnitude comparable to exchange interactions, and strong antiferromagnetic interactions in 3. Variable-temperature magnetic studies of two structurally characterized pentanuclear nickel(II) complexes and one tetranuclear copper(II) complex synthesized from a series of compartmental ligands reveal both ferromagnetic and antiferromagnetic interactions in the pentanickel complexes and strong antiferromagnetic interactions in tetracopper cluster. Copyright
Syntheses, Characterization, and Magneto-Structural Analyses in μ1,3-Acetato-Bridged Tetracopper(II) and μ1,3- and μ1,1,3-Acetato-Bridged Pentanickel(II) Clusters
Das, Sudhanshu,Sorace, Lorenzo,Guha, Averi,Sanyal, Ria,Kara, Hulya,Caneschi, Andrea,Zangrando, Ennio,Das, Debasis
, p. 2753 - 2765 (2015/04/27)
Two pentanuclear NiII complexes, [Ni5(L1)2(CH3COO)6(OH)2(MeOH)2] (1) and [Ni5(L2)2(CH3COO)6(OH)2(H2O)2] (2), and one tetranuclear CuII complex, [Cu4(L3)2(CH3COO)4(O)] (3), have been synthesized from phenol-based end-off compartmental ligands HL1 to HL3 {HL1 = 2,6-bis[ethyl(2-thienyl)iminomethyl]-4-tert-butylphenol; HL2 = 2,6-bis[ethyl(2-thienyl)iminomethyl]-4-chlorophenol and HL3 = 2,6-bis[ethyl(2-thienyl)iminomethyl]-4-methylphenol, respectively}. The complexes have been structurally characterized and their magnetic properties have been investigated within the temperature range 2.2-300 K. Complexes 1 and 2 comprise two dinuclear [Ni2L2] units linked to a central Ni ion by bridging μ3-hydroxo groups. The cluster is stabilized by syn-syn-μ1,3-bridging and μ1,1,3-bridging acetate anions. The structural analysis of 3 revealed two crystallographically independent complexes that consisted of a tetrahedron of CuII ions connected to a central μ4-oxo species and further bridged by four acetate groups along four of the six edges of the Cu4 core. The other two edges are occupied by μ-phenoxo bridges from the deprotonated L3 ligand. Magnetic investigations revealed both ferromagnetic and antiferromagnetic interactions in 1 and 2 with single-ion zero-field splitting of magnitude comparable to exchange interactions, and strong antiferromagnetic interactions in 3.
