0000000000308941
AUTHOR
Hari Pada Nayek
Syntheses, structures and magnetic properties of cyano-bridged one-dimensional Ln3+–Fe3+ (Ln = La, Dy, Ho and Yb) coordination polymers
Four new heterometallic one-dimensional coordination polymers with formulae trans-[La(o-phen)3(H2O)(μ-CN)2Fe(CN)4]·7H2O (1) and trans-[Ln(H2O)2(phen)2(μ-CN)2Fe(CN)4]·nH2O [Ln/n = Dy/8 (2), Ho/7 (3) and Yb/7 (4), (o-phen = 1,10-phenanthroline)] have been synthesized by reacting Ln(NO3)3·xH2O with K3[Fe(CN)6] and 1,10-phenanthroline. The structures of 1–4 have been established by single crystal X-ray diffraction. Polymer 1 presents a chain structure with three o-phen ligands coordinated to La3+ and [Fe(CN)6]3− complexes connecting them through two trans CN− ligands to form a linear chain. Compounds 2–4 are solvates and contain Ln3+ ions coordinated to two o-phen ligands and also bridged by [F…
Solvent Modulated Assembly of Two Ni(II) Complexes: Syntheses, Structures and Magnetic Properties
A dinuclear [Ni2(L)2(DMSO)2(MeOH)2] (1) and a tetra-nuclear [Ni4(L)4(DMF)2(H2O)2].DMF (2) Ni(II) complexes have been prepared by treating nickel nitrate hexahydrate with the Schiff base ligand H2L (H2L=(E)-2-(2-hydroxybenzyliden)amino-4-nitrophenol) in a one-pot reaction. Complex 1 was obtained after recrystallization of the precipitate from the reaction with a 1:1:1 mixture of DMSO/CH2Cl2/MeOH. In contrast, the tetrameric complex 2 was obtained after slow evaporation of the filtrate. Both complexes were characterized by analytical, thermogravimetric, optical and magnetic techniques. The solid state molecular structures of 1 and 2 were determined by single crystal X-ray crystallography. Com…
Trinuclear Lanthanide Coordination Clusters: Single-Molecule-Magnet Behavior and Catalytic Activity in the Friedel-Crafts Alkylation Reaction.
A new multidentate ligand (H3 L) was synthesized by the condensation reaction of 4-tert-butyl-2,6-diformylphenol and 2-amino-4-nitrophenol. The reaction of the ligand with hydrated lanthanide nitrate produced two isostructural trinuclear coordination clusters: [DyLn3 L3 (DMF)3 (H2 O)2 ] ⋅ 3.8DMFLn=Dy (1) and Nd (2) (DMF=N, N-dimethylformamide). Single-crystal X-ray diffraction analysis revealed that there are three lanthanide ions arranged in an almost perfect linear fashion in both complexes. Magnetic studies show single-molecule-magnet (SMM) behavior in the Dy derivative with τ0 =1.7×10-6 s and a thermal energy barrier of 7.0 cm-1 . Both complexes were used as catalysts towards the Fried…
A ferromagnetic tetranuclear nickel(II) Schiff-base complex with an asymmetric Ni4O4 cubane core
Abstract The ferromagnetic tetranuclear nickel(II) complex [Ni4(L)4(CH3OH)2]·2MeOH·8H2O (1) has been synthesized by reacting nickel nitrate hexahydrate with the Schiff base ligand H2L (H2L = N-(2-hydroxyphenyl)-3-methoxy-salicylideneamine). Complex 1 was characterized by analytical, thermogravimetric, optical and magnetic techniques. The solid state structure of 1 was established by single crystal X-ray diffraction analysis. Crystal structure determination shows the formation of a distorted Ni4O4 cubane moiety encapsulated by four Schiff base ligands. Compound 1 crystallizes in the triclinic space group P 1 ¯ with a = 12.7624(9) A, b = 15.0477(9) A, c = 16.8589(10) A, α = 94.732(2)°, β = 94…
Co-crystallization of Keggin type polyoxometalates [HL]3[PW12O40] and [Ln(DMF)8][PW12O40] (Ln=La, Dy, Yb) (L=N-(2-hydroxyphenyl)-3-methoxy-salicylideneamine): Syntheses, structures and magnetic properties
Abstract Four new Keggin type polyoxometalate clusters [HL]3[PW12O40]·5MeOH (1) and [Ln(DMF)8][PW12O40] {Ln = La (2), Dy (3), Yb (4)} (L = N-(2-hydroxyphenyl)-3-methoxy-salicylideneamine) have been synthesized. Co-crystallization of complex 1 with each of the three complexes 2–4 takes place when the Schiff base ligand is treated with hydrated phosphotungstic acid, H3[PW12O40]·xH2O, hydrated lanthanide nitrate, Ln(NO3)3·6H2O in the presence of Ni(NO3)2·6H2O. The Schiff base ligand is protonated in complex 1 and thus it is neutralizing the charge of the polyoxotungstate anion, [PW12O40]3−. A dimethylformamide (DMF) coordinated trivalent lanthanide ion balances the negative charge of the polyo…
CCDC 1054137: Experimental Crystal Structure Determination
Related Article: Souvik Pal, Kartick Dey, Samia Benmansour, Carlos J. Gómez-García, Hari Pada Nayek|2019|New J.Chem.|43|6228|doi:10.1039/C8NJ05173A
CCDC 1054136: Experimental Crystal Structure Determination
Related Article: Souvik Pal, Kartick Dey, Samia Benmansour, Carlos J. Gómez-García, Hari Pada Nayek|2019|New J.Chem.|43|6228|doi:10.1039/C8NJ05173A
CCDC 1499648: Experimental Crystal Structure Determination
Related Article: Richa Vinayak, A. Harinath, Carlos J. Gomez-Garcıa, Tarun K. Panda, Samia Benmansour, and Hari Pada Nayek|2016|Chem. Sel.|1|6532|doi:10.1002/slct.201601385
CCDC 1419401: Experimental Crystal Structure Determination
Related Article: Sudeshna Saha, Partha P. Jana, Carlos J. Gómez-García, Klaus Harms, Hari Pada Nayek|2016|Polyhedron|104|58|doi:10.1016/j.poly.2015.11.035
CCDC 1419400: Experimental Crystal Structure Determination
Related Article: Sudeshna Saha, Partha P. Jana, Carlos J. Gómez-García, Klaus Harms, Hari Pada Nayek|2016|Polyhedron|104|58|doi:10.1016/j.poly.2015.11.035
CCDC 1054139: Experimental Crystal Structure Determination
Related Article: Souvik Pal, Kartick Dey, Samia Benmansour, Carlos J. Gómez-García, Hari Pada Nayek|2019|New J.Chem.|43|6228|doi:10.1039/C8NJ05173A
CCDC 1499647: Experimental Crystal Structure Determination
Related Article: Richa Vinayak, A. Harinath, Carlos J. Gomez-Garcıa, Tarun K. Panda, Samia Benmansour, and Hari Pada Nayek|2016|Chem. Sel.|1|6532|doi:10.1002/slct.201601385
CCDC 1419402: Experimental Crystal Structure Determination
Related Article: Sudeshna Saha, Partha P. Jana, Carlos J. Gómez-García, Klaus Harms, Hari Pada Nayek|2016|Polyhedron|104|58|doi:10.1016/j.poly.2015.11.035
CCDC 1054138: Experimental Crystal Structure Determination
Related Article: Souvik Pal, Kartick Dey, Samia Benmansour, Carlos J. Gómez-García, Hari Pada Nayek|2019|New J.Chem.|43|6228|doi:10.1039/C8NJ05173A
CCDC 1419403: Experimental Crystal Structure Determination
Related Article: Sudeshna Saha, Partha P. Jana, Carlos J. Gómez-García, Klaus Harms, Hari Pada Nayek|2016|Polyhedron|104|58|doi:10.1016/j.poly.2015.11.035