Prateeti Chakraborty

Bangabasi College

A series of polymeric manganese(II),cobalt(II), nickel(II), copper(II) complexes have been prepared having general formula [MII(µ1,5-dca)2(Quin)2]n (where Quin and dca represents quinoxaline and dicyanamide respectively and M = Mn, Co, Ni, Cu for complex 1, 2, 3 and 4 respectively) and characterized by routine physicochemical techniques such as ele...

Three Schiff base ligands have been synthesized via condensation between 2,6-diformyl-4-R-phenol [where R= tert-butyl (HL1), iso-propyl (HL2) , and chloro (HL3)] and N,N-dimethylethylene-1,2-diamine to prepare a series of copper(II) complexes. [Cu2(L1)(OH)(ClO4)](ClO4) (1) and [Cu2(L1)(SCN)3] (2) were synthesized from HL1 whereas [Cu2(L2)(SCN)2](Cl...

A series of multinuclear heterometallic Cu-Zn complexes of molecular formula [(CuL)2Zn(dca)2] (1), [(CuL)2Zn(NO3)2] (2), [(CuL)2Zn2(Cl)4] (3), and [(CuL)2Zn2(NO2)4] (4) have been synthesized by reacting [CuL] as a "metalloligand (ML)" (where HL = N,N′-bis(5-chloro-2-hydroxybenzylidene)-2,2-dimethylpropane-1,3-diamine) and by varying the anions or c...

Condensation of N-(2-hydroxyethyl)ethylenediamine and pyridine-2-carbaldehyde in presence of ZnX2 salts (X = ClO4-, Cl-, Br-, I-) generates four complexes, namely [ZnL1Cl](ClO4) (1), [ZnL1Cl][ZnCl3(H2O)].2H2O (2), [ZnL1Br][ZnBr3(H2O)].2H2O (3), and [Zn(L2)3]I2 (4), where L1 and L2 are aminal and hemiaminal ether derivatives i.e, (E)-N-((pyridine-2-...

A tridentate N,N,O donor ligand 2,4-dichloro-2-[(2-piperazine-4-yl-ethylimino)-methyl]-phenol (HL) was designed, and eight new Zn(II) and Cd(II) complexes, namely, [Zn(LH)(SCN)2] (1), [Zn(LH)(N3)2] (2), [Zn(LH)(NO2)2] (3), [Zn(LH)(dca)(OAc)] (4), [Cd2(LH)2(SCN)4] (5), [Cd(LH)(N3)2] (6), [Cd(LH)(NO2)2] (7), and [Cd(LH)(dca)(OAc)] (8) [where dca = di...

By using a potential tridentate ligand L ((2-piperazine-1-yl-ethyl)-pyridin-2-yl-methylene-amine), a series of group 12 metal complexes namely, [ZnLHCl2][Zn2LCl5]·2H2O (1), [CdL(SCN)2(CH3OH)]n (2), and [Hg(l-pyCO)Cl2] (3), were synthesized and structurally characterized. In all the complexes the piperazine nitrogen of the ligand takes part in coord...

The reaction of a pentadentate compartmental ligand LH, namely 4-tert-Butyl-2,6-bis-[(2-pyridin-2-yl-ethylimino)-methyl]-phenol, with group 12 metal ions (ZnII, CdII, HgII) followed by addition of NaSCN afforded one discrete dinuclear complex [Zn2(L)(SCN)3](1), and two polymeric 1D species [Cd2.5(L)(SCN)3(AcO)]n (2) and [Hg2(L)(SCN)3]n (3). All the...

Two "end-off" compartmental ligands, 2-formyl-4-chloro-6-N-ethylmorpholine-iminomethyl-phenol (HL1) and 2-formyl-4-methyl-6-N-ethylpyrrolidine-iminomethyl-phenol (HL2) have been designed and three complexes of Mn(ii), one mono-, one di- and a polynuclear, namely Mn(L1)(SCN)2(H2O)] (), [Mn2(L1)(OAc)2](BPh4)] (), and [Mn2(L2)(OAc)2(dca)]n () have bee...

A Schiff-base ligand, 4-Bromo-2-[(2-hydroxy-1,1-dimethyl-ethylimino)-methyl]-phenol (HL1) and its reduced analogue 4-Bromo-2-[(2-hydroxy-1,1-dimethyl-ethylamino)-methyl]-phenol (HL2) have been synthesized. Reaction of Cu(ClO4)2.6H2O with HL1 and HL2 in presence of sodium dicyanamide have been investigated in MeOH and MeCN. HL1 generates [Cu(L1)(MeO...

The reactions of pyridine-2-carbaldehyde with aminoalcohols N-(2-hydroxyethyl)ethylenediamine and 2-(3-aminopropylamino)ethanol in presence of CdIIX2 (X=Cl, Br, I) have been investigated. Structure analyses reveal that four complexes, namely [Cd2(L¹)2(Br)4] (2), [Cd(L¹)(I)2](3), [Cd(L¹)(Br)2] (5) and [Cd(L²)(I)2] (6) are formed with the expected Sc...

Six N,N,O-donor Schiff-base ligands, HL1-HL6, [HL1/HL2/HL3={2-(2-piperazin-1-yl)ethylimino)methyl)-4-(Cl/H/Me)-phenol}; HL4/HL5/HL6={2-(2-morpholine/piperidine/ pyrrolidine −1-yl)ethylimino)methyl)-4-chlorophenol}, have been designed by combining 5-R-2-hydroxy-benzaldehyde, (R=Cl/H/Me) and N-(2-aminoethyl)-Y, (Y=piperazin/morpholine/ piperidine/pyr...

A novel dinuclear m-diphenoxo-m-acetato metallohydrolase [Ni 2 L 2 (NCS)(Ac)(H 2 O) 0.5 (MeOH) 0.5 ]Á1.25H 2 O (HL = 2-((E)-(2-(pyridin-2-yl)ethylimino)methyl)-4-chlorophenol) with an intermetallic separation of 3.099 Å has been synthesized and characterized both structurally and spectroscopically. Temperature dependent (2–300 K) magnetic susceptib...

With an aim to study the electronic effect of the group lying in the para-position of phenol-based compartmental Mannich-base ligands, five dinuclear nickel(ii) complexes [Ni2L¹⁻⁵(μ-NO3)(NO3)2] have been synthesized [R = Me (1), CHMe2 (2), CMe3 (3), Cl (4), and OMe (5)] having octahedral structures (fac-manner) in each case as confirmed by single-c...

Addition of 1,3-propane diamine to 2,6-diformyl-4-tert-butyl phenol in ethanol produces a site-selective imination product N,N0-propylenebis(3-formyl-5-tert-butylsalicylaldimine), an acyclic side-off compartmental ligand (H2L). In the presence of zinc nitrate the ligand goes on hydrolysis in 50 : 50 water–acetonitrile medium and forms a partially h...

Three varieties of copper sulphide nanoparticles, namely CuS-I, CuS-II and CuS-III have been synthesized from three different precursors Cu(Im)2(SCN)2 (1), Cu(Mim)2(SCN)2 (2) and Cu(Bim)2(SCN)2 (3), [Im: imidazole; Bim: Benzimidazole and Mim: 1-methyl imidazole respectively] using pyrolytic technique and have been characterized by routine physicoch...

The tridentate Schiff base ligand 2-((E)-((pyridin-2-yl)methylimino)methyl)phenol (HL) was used to synthesize four new cadmium(II) complexes, namely [Cd4L6](ClO4)2 (1), [CdL(SCN)]n (2), [CdL(dca)]n (3) and [CdL(N3)]n (4), with the aim of exploring the role of the coordinating and non-coordinating anion in governing the architecture as well as the p...

Three dinuclear zinc(ii) complexes with "end-off" compartmental ligands, namely 2,6-bis(N-ethylmorpholine-iminomethyl)-4-R-phenol (R = -CH3, Cl, (t)Bu) have been synthesized with the aim of exploring the role of the para substituent present in the ligand backbone in controlling the structural diversity, photophysical properties and different weak i...

A dinuclear Cu(II) species [Cu2L2(H2O)2(N3)](NO3)2 (L = 2,6-bis(N-ethylpyrrolidine-iminomethyl)-4-methyl-phenolato) where two Cu centers are bridged by phenoxido and μ1,1-azido bridges with Cu–Cu separation of ∼3 Å have been synthesized with the view to explore the role of azido bridge on catecholase activity and electrochemical property and the ro...

A dinuclear Cu(II) species [Cu 2 L 2 (H 2 O) 2 (N 3)](NO 3) 2 (L = 2,6-bis(N-ethylpyrrolidine-iminomethyl)-4-methyl-phenolato) where two Cu centers are bridged by phenoxido and l 1,1-azido bridges with Cu–Cu separation of $3 Å have been synthesized with the view to explore the role of azido bridge on catecholase activity and electrochemical propert...

A series of four mononuclear Schiff-base complexes, namely, [Zn(L)(NCS)2] (1), [Zn(L)(N3)2] (2), [Cu(L)(NCS)2] (3) and [Ni (L)(2bpy)(NCS)](ClO4) (4), [where L = N,N-dimethyl-N′-(phenyl-pyridin-2-yl-methylene)-ethane-1,2-diamine and 2bpy = 2-benzoylpyridine] were synthesized with the aim of investigating the role of different non-covalent weak inter...

An “end-off” pentadentate compartmental ligand HL has been synthesized by Mannich base condensation using p-cresol and 2-benzyl amino ethanol and structurally characterized. A dinuclear copper(II) complex, namely [Cu2(L)(µ-OH)(H2O)(ClO4)2], has been prepared by treating HL with Cu(ClO4)2.6H2O in methanolic solution with the aim to investigate its c...

Three varieties of nickel oxide nanoparticles [NiO(I), NiO(Br) and NiO(Cl)] have been prepared from three simple mononuclear nickel(II) Schiff-base complexes using pyrolytic technique. The synthesized nanoparticles are characterized by FT-IR, UV-Vis, PXRD, DLS, SEM, TEM and EDX method. All the techniques suggest the production of highly pure nickel...

The compartmental ligand 2,6-bis{2-(N ethyl)thiopheneiminomethyl}-4-chloro-phenol (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′). HL′ on further reaction with Cu(ClO4)2 produces a dinuclear complex, [Cu2(L′)2(ClO4)2] 2 which has been characterized...

By using two potential tridentate ligands, HL1 [4-chloro-2-[(2-morpholin-4-yl-ethylimino)-methyl]-phenol] and 4-chloro-2-[(3-morpholin-4-yl-propylimino)-methyl]-phenol], which differ by one methylene group in the alkyl chain, four new Zn-II complexes, namely, [Zn((LH)-H-2)(2)](ClO4)(2) (1), [Zn(L-1))(H2O)(2)][Zn(L-1)(SCN)(2)] (2), [Zn(L-1))(dca)](n...

A library of 15 dicopper complexes as synthetic analogues of catechol oxidase has been synthesized with the aim to determine the relationship between the electrochemical behavior of the dicopper(II) species in the absence as well as in the presence of 3,5-di-tert-butylcatechol (3,5-DTBC) as model substrate and the catalytic activity, kcat, in DMSO...

A novel trinuclear zinc(II) complex [Zn3L2(μ-O2CCH3)2(CH3OH)4] (1) that contains an N,O-donor Schiff base ligand {H2L = 2-[(2-hydroxyphenylimino)methyl]-6-methoxyphenol} has been synthesized and crystallographically characterized. The X-ray crystal structure of 1 contains three zinc(II) centers, which have distorted-octahedral coordination geometry...

Two varieties of Co3O4 nano particles (Co3O4-I and Co3O4-II) have been synthesized from two different precursors using a pyrolytic technique. Co3O4-I was prepared by using a coordination polymer [Co(dca)2(2-benzoylpyridine)]n (dca = dicyanamide) as sole precursor, whereas Co3O4-II was obtained from a dinuclear complex [Co2(HL)(OAc)2](OAc)2·4H2O [HL...

Three new dicyanamide (dca) mediated isostructural polymeric complexes of quinoxaline (quin) of d10 metal ions having the formula [M(quin)2(dca)2]n [where M = Zn(II), Cd(II) and Hg(II)] have been synthesized and two of them have been characterized by X-ray single crystal structure analysis. The structure analyses reveal that the complexes are 1D co...

Three new mononuclear nickel(II) complexes, namely, [NiL(1)(H2O)3]I2·H2O (1), [NiL(1)(H2O)3]Br2·H2O (2), and [NiL(1)(H2O)3]Cl2·2H2O (3) [HL(1) = 2-[(2-piperazin-1-ylethylimino)methyl]phenol], have been synthesized and structurally characterized. Structural characterization reveals that they possess similar structure: [NiL(1)(H2O)3](2+) complex cati...

Seven dinuclear and one dinuclear based dicyanamide bridged polymeric Ni(II) complexes of phenol based compartmental ligands (HL(1)-HL(4)) have been synthesized with the aim to investigate their catecholase-like activity and to evaluate the most probable mechanistic pathway involved in this process. The complexes have been characterized by routine...

Reactions of zinc(II) and cadmium(II) halides with an N,N,O-donor Schiff-base ligand HL (obtained by the 1:1 condensation of salicylaldehyde and 2-(2-aminoethyl)pyridine) yield six new phenoxo bridged dinuclear complexes of the general formula [Zn2L2X2] (1–3) and [Cd2L2X2] (4–6), where X = Cl, Br and I, respectively. The complexes have been charact...

Two diastereomeric forms of the μ4-oxo-bridged tetranuclear copper(II) complex [Cu4(O)(L)2(Ac)4] (where L = N2,O-donor Schiff-base ligand and Ac = acetate anion), differing for the bridging arrangement of the carboxylate groups, were individually synthesized and structurally characterized. Their formation was rationalized by DFT calculation and the...