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Hydrothermal Synthesis and Structure of a New 3D Lanthanide‐Carboxylate Framework, [La(btec) 1/2 (H 2 btec) 1/2 (H 2 O)] n (H 4 btec = 1,2,4,5‐Benzenetetracarboxylic acid)
Author(s) -
DaoFeng Sun,
WenHua Bi,
Rong Cao,
Xing Li,
Qian Shi,
MaoChun Hong
Publication year - 2003
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20030210411
Subject(s) - chemistry , carboxylate , triclinic crystal system , lanthanide , protonation , crystallography , oxygen atom , hydrothermal circulation , molecule , hydrothermal synthesis , stereochemistry , ion , crystal structure , organic chemistry , seismology , geology
The title complex, [La(btec) 1/2 (H 2 btec) 1/2 (H 2 O)] n (H 4 btec= 1, 2,4,5‐benzenetetracarboxylic acid) (1) was synthesized by the hydrothermal reaction of 1,2,4,5‐benzenetetracarboxylic dianhydride with La(NO 3 ) 3 ·6H 2 O in H 2 O, and crystallizes in the triclinic system, space group P ‐1 with a = 0.64403(3) nm, b = 0.94500(4) nm, c = 0.96380(5) nm, a = 88.535(2)°, β = 100.314(2)°, γ = 76.6470(10)°, V = 1.60968(10) nm 3 , Z = 2, and final R = 0.0274, R w = 0.0735. In 1, each La(m) ion is coordinated by eight oxygen atoms from six carboxylate groups and one coordinated water molecule. Two different coordination modes of H 4 btec were present in the structure, one of which contains two protonated carboxylate groups to balance the charge.