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Synthesis, Structure and Photoluminescent Studies of Two Novel Layered Uranium Coordination Polymers Constructed from UO(OH) Polyhedra and Pyridinedicarboxylates
Author(s) -
Zheng YanZhen,
Tong MingLiang,
Chen XiaoMing
Publication year - 2005
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.200500399
Subject(s) - orthorhombic crystal system , chemistry , crystallography , hydrothermal reaction , hydrothermal circulation , crystal structure , polymerization , hydrothermal synthesis , uranium , polyhedron , polymer , group (periodic table) , fluorescence , geometry , materials science , organic chemistry , metallurgy , physics , mathematics , seismology , geology , quantum mechanics
Two new uranium coordination polymers have been obtained from the hydrothermal reaction of (UO 2 )(CH 3 COO) 2 · 2H 2 O with 3,4‐pyridinedicarboxylic acid (3,4‐pydaH 2 ) or 2,4‐pyridinedicarboxylic acid (2,4‐pydaH 2 ). [(UO 2 ) 3 (μ 3 ‐O)(μ 3 ‐OH) 2 (3,4‐pydaH)(3,4‐pyda) 0.5 ] n ( 1 ) crystallizes in the orthorhombic space group Pccn with a = 18.168(2), b = 12.635(1), c = 16.149(1) Å, V = 3707.0(5) Å 3 , and Z = 8. [(UO 2 ) 3 (μ 3 ‐O)(μ 3 ‐OH)(μ 2 ‐OH)(2,4‐pyda)(H 2 O) 2 ] n · n H 2 O ( 2 ) is in the orthorhombic space group Pbcn with a = 22.788(2), b = 7.1468(5), c = 21.627(1) Å, V = 3522.1(4) Å 3 , and Z = 8. Complex 1 features a wave‐like 2D layer that is constructed by connecting the 1D UO(OH) ribbons by the V‐shaped 3,4‐pyda or 3,4‐pydaH ligands. Complex 2 is a rare hexameric species amongst uranium compounds and features a (4,4) planar “open‐layer”, which is constructed by the 4‐connected hexameric UO(OH) polyhedra and the 2‐connected 2,4‐pyda ligands. The fluorescence emission (521 nm) of 2 is red‐shifted by about 13 nm (emission) and about 40 nm (excitation) compared to that of 1 , and the lifetimes increase with the polymerization of UO(OH) polyhedra (145 μs for 1 compared to 24.4 μs for 2 ). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)