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Synthesis, Structure and Optical Studies of a Family of Three‐Dimensional Rare‐Earth Aminoisophthalates [M(μ 2 ‐OH)(C 8 H 5 NO 4 )] (M = Y 3+ , La 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Dy 3+ , and Er 3+ )
Author(s) -
Sarma Debajit,
Prabu Manikanda,
Biju Silvanose,
Reddy M. L. P.,
Natarajan Srinivasan
Publication year - 2010
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201000225
Subject(s) - chemistry , excited state , metal , lanthanide , doping , crystallography , hydrothermal circulation , rare earth , ion , hydrothermal synthesis , stereochemistry , inorganic chemistry , mineralogy , atomic physics , physics , optoelectronics , organic chemistry , seismology , geology
Abstract A hydrothermal reaction of the acetate salts of the rare‐earths, 5‐aminoisophthalic acid (H 2 AIP), and NaOH at 150 °C for 3 days gave rise to a new family of three‐dimensional rare‐earth aminoisophthalates, [M(μ 2 ‐OH)(C 8 H 5 NO 4 )] [M = Y 3+ ( I ), La 3+ ( II ), Pr 3+ ( III ), Nd 3+ ( IV ), Sm 3+ ( V ), Eu 3+ ( VI ), Gd 3+ ( VII ), Dy 3+ ( VIII ), and Er 3+ ( IX )]. The structures contain M–O(H)–M chains connected by AIP anions. The AIP ions are connected to five metal centers and each metal center is connected with five AIP anions giving rise to a unique (5,5) net. To the best of our knowledge, this is the first observation of a (5,5) net in metal‐organic frameworks that involve rare‐earth elements. The doping of Eu 3+ /Tb 3+ ions in place of Y 3+ /La 3+ in the parent structures gave rise to characteristic metal‐centered emission (red = Eu 3+ , green = Tb 3+ ). Life‐time studies indicated that the excited emission states in the case of Eu 3+ (4 mol‐% doped) are in the range 0.287–0.490 ms and for Tb 3+ (4 mol‐% doped) are in the range of 1.265–1.702 ms. The Nd 3+ ‐containing compound exhibits up‐conversion behavior based on two‐photon absorption when excited using λ = 580 nm.