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Syntheses, Crystal Structure, Luminescence, Porosity and Magnetic Properties of Three‐Dimensional Lanthanide Coordination Polymers with 2‐Aminoterepthalic Acid
Author(s) -
Kariem Mukaddus,
Yawer Mohd,
Sharma Swati,
Sheikh Haq N.
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600844
Subject(s) - monoclinic crystal system , luminescence , crystallography , lanthanide , thermogravimetric analysis , crystal structure , materials science , coordination polymer , thermal stability , polymer , magnetic susceptibility , coordination number , powder diffraction , ligand (biochemistry) , chemistry , ion , organic chemistry , biochemistry , receptor , optoelectronics , composite material
Ten isomorphous coordination polymers (CPs) with the formula [Ln 2 (ATPA) 3 (DEF) 2 ] n Ln = Ce ( 1 ), Pr( 2 ), Nd ( 3 ), Eu ( 5 ), Gd ( 6 ) and [Ln(ATPA) 1.5 (DEF)] n Ln = Sm ( 4 ), Tb ( 7 ), Dy ( 8 ), Ho ( 9 ) and Y( 10 ) (H 2 ATPA=2‐aminoterepthalic acid and DEF=diethyl formamide) have been synthesized by the self assembly of Ln(III) ions, 2‐aminoterepthalate and DEF under solvothermal condition. These polymers have been systematically characterized by single‐crystal X‐ray diffraction, FTIR, PXRD, thermogravimetric (TGA) and elemental analyses. Structure analyses of CPs 1–10 reveal that all CPs crystallize in the monoclinic space group C 2/c system and form 3D framework with difference in coordination numbers. The CPs 1 & 2 exhibit eight coordination numbers whereas CPs 3–10 show seven coordination number with different geometries. TGA indicate thermal stability and robustness of the synthesized CPs. The Sm ( 4 ), Eu ( 5 ), Tb ( 7 ) and Dy ( 8 ) polymers emit strong ligand sensitized characteristic f‐f luminescence. Analyses of magnetic susceptibility data of CPs 4, 6 , 7 & 8 at variable temperatures and applied magnetic fields reveal weak ferromagnetic interactions at low temperatures.