2287-28-7Relevant articles and documents
Rare examples of diphenoxido-bridged trinuclear NiII2FeIII complexes with a reduced salen type Schiff base ligand: Structures and magnetic properties
Hazari, Alokesh,Gómez-García, Carlos J.,Drew, Michael G.B.,Ghosh, Ashutosh
, p. 145 - 153 (2017)
Three new trinuclear hetero-metallic complexes, [(NiLR)2Fe(N3)3] (1), [(NiLR(H2O))2Fe(C6H5CH2CO2)2]·(HSO4) (2) and [(NiLR(H2O))2Fe(C6H5CO2)2]·(HSO4)·(H2O)·(CH2Cl2) (3) have been synthesized using [NiLR] as a “metalloligand” (where H2LR = N,N′-bis(2-hydroxybenzyl)-1,3-propanediamine). All complexes have been characterized by elemental analysis, spectroscopic methods, single crystal XRD and magnetic study. In the angular trinuclear units of 1, the two terminals [NiLR] coordinate through double phenoxido bridges to the central FeIII ion which is penta-coordinated having terminally coordinated azide ion. The two terminal NiII centers are connected to each other and also to neighbouring units through μ1,3-azido bridges to form an alternating chain. On the other hand, complexes, 2 and 3 are linear discrete trinuclear species [NiII–FeIII–NiII] in which two terminal octahedral [NiLR] units coordinate to the central octahedral FeIII ion, located on a crystallographic centre of symmetry, through a μ2-phenoxido oxygen atom and a bridging carboxylato ion. Variable temperature magnetic susceptibility measurements show the presence of antiferromagnetic exchange interactions in 1 mediated through the phenoxido bridges (J1 = ?33.2 cm?1,) and μ1,3-N3 single bridges (J2 = ?19.9 cm?1 and J3 = ?16.7 cm?1). On the other hand, compounds 2 and 3 show ferromagnetic coupling interactions mediated through the double phenoxido bridges with J values of +4.9 and +3.0 cm?1 for 2 and 3, respectively.
Synthesis, crystal structure and urease inhibition of a trinuclear copper(II) complex with reduced Schiff base ligand
Duan, Mengmeng,Li, Yanmin,Xu, Luyao,Yang, Huailan,Luo, Fuwen,Guan, Yixing,Zhang, Bitong,Jing, Changling,You, Zhonglu
, p. 27 - 31 (2019)
A trinuclear copper(II) complex, [Cu3L2]·2ClO4·2CH3CN, with the reduced Schiff base ligand 2,2′-((propane-1,3-diylbis(azanediyl))bis(methylene))diphenol (H2L) was prepared. The complex was characterized by elemental analysis, IR and UV–Vis spectra, and single crystal X-ray diffraction. The ligand coordinates to the Cu atoms through the amino nitrogen and phenolate oxygen, giving square planar geometry. The ligand and the complex were tested for their Jack bean urease inhibitory activities. The IC50 value of the complex on the urease inhibition is 1.6 ± 1.2 μmol·L?1. Molecular docking study of the complex was performed to study the inhibition.
Two dinuclear NiII–CdII complexes of reduced ONNO-type Schiff bases: Synthesis, crystal structures, thermal kinetic analysis and DFT studies
S?nmez,Nazir,Emir,Svoboda,Aksu,Atakol
, p. 3077 - 3091 (2017/10/30)
Two ONNO-type Schiff bases, bis-N,N′-(salicylidene)-1,3-diaminopropane and bis-N,N′-(2-hydroxyacetophenylidene)-1,3-propanediamine, were reduced using NaBH4 and converted to two phenol–amine-type tetradentate ligands, bis-N,N′-(2-hydroxybenzyl)-1,3-diaminopropane (LHH2) and bis-N,N′-[1(2-hydroxyphenyl)ethyl]-1,3-diaminopropane (LACHH2). These ligands were used to prepare two NiII–CdII heterodinuclear complexes, namely [DMF·NiLH·CdI2·DMF] and [DMF·NiLACH·CdBr2·DMF] in DMF medium. The molecular structure and unit cells of these complexes have been elucidated by the use of X-ray diffraction data. The thermogravimetric analysis of the compounds revealed that as the temperature is increased, the first coordinative DMF molecule was removed from the structure followed by a second coordinative DMF molecule with the complete decomposition of the complex. The activation energies and Arrhenius pre-exponential factor of these thermal reactions were determined by the use of isothermal Coats–Redfern, nonisothermal Ozawa–Flynn–Wall and Kissinger–Akahira–Sunose methods. The results obtained for the first thermal reaction were similar since the structure of both complexes remained intact during this process. Also, the theoretical calculations of the bond lengths, bond angles and natural bond orbital analysis of both complexes were carried out using the algorithms embedded in Gaussian 09 software.
H-bond assisted coordination bond formation in the 1D chains based on azido and phenoxido bridged tetranuclear Cu(II) complexes with reduced Schiff base ligands
Hazari, Alokesh,Diaz, Carmen,Ghosh, Ashutosh
, p. 16 - 24 (2018/01/17)
Two new 1D chains [(CuL1R)2Cu2(N3)2(μ1,1,3-N3)2]n (1) and [{(CuL2R)2Cu2(N3)2(μ1,1,3-N3)2}·(CH3)2CO]n (2) based on rare μ1,1,3-N3 bridged tetranuclear Cu(II) complexes, have been synthesized using [CuL1R] and [CuL2R] as “metalloligands” [where H2L1R = N,N′-bis(2-hydroxybenzyl)-1,3-propanediamine and H2L2R = N,N′-bis(2-hydroxybenzyl)-1,2-ethylenediamine]. Both complexes have been characterized by elemental analysis, spectroscopic methods, single crystal XRD, and magnetic study. In case of chain 1, the basic building block is a centrosymmetric tetranuclear unit whereas for 2, it is an asymmetric tetranuclear unit containing two types of square pyramidal Cu(II) centers (terminal and central). The μ1,1-N3 bridged central copper atoms of one tetranuclear unit are connected weakly to the axial position of the terminal copper atoms of neibouring units via the azide ions forming a rare μ1,1,3-N3 bridged novel 1D polymeric chain structure. Variable temperature magnetic susceptibility measurements show the presence of an overall strong antiferromagnetic exchange interactions mediated through the double phenoxido bridges with J values of ?123.8 and ?144.6 cm?1 for 1 and 2, respectively.
