TY - JOUR
T1 - New europium coordination polymers with efficient energy transfer from conjugated tetracarboxylate ligands to Eu3+ ion
T2 - Syntheses, structures, luminescence and magnetic properties
AU - Wang, Li Feng
AU - Kang, Ling Chen
AU - Zhang, Wen Wei
AU - Wang, Fang Ming
AU - Ren, Xiao Ming
AU - Meng, Qing Jin
PY - 2011/10/7
Y1 - 2011/10/7
N2 - Two novel lanthanide coordination polymers, [Eu2(EBTC)(DMF) 5(NO3)2]·DMF (1) and [Eu 2(BBTC)1.5(CH3OH)2(H 2O)2]·7DMF·HNO3 (2) (EBTC 4- = 1,1′-ethynebenzene-3,3′,5,5′-tetracarboxylate; BBTC4- = 1,1′-butadiynebenzene-3,3′,5,5′- tetracarboxylate), were successfully synthesized from conjugated ligands of EBTC4- and BBTC4-. Although the two tetracarboxylate ligands have similar structures, their different rigidity/flexibility results in quite different networks upon complexation. Complex 1 has a two-dimensional (2-D) layered structure with two crystallographically independent Eu 3+ ions, one in a distorted monocapped square-antiprism and the other in a distorted square-antiprism coordination geometry. Complex 2 exhibits a three-dimensional (3-D) porous framework, with one type of Eu3+ in a distorted square-antiprism and the other in a trigondodecahedron environment. Both 1 and 2 emit the intensely red characteristic luminescence of Eu 3+ ion at room temperature, with a long lifetime of up to 1.3 and 0.7 ms, respectively, during which the ligand emission of EBTC4-/ BBTC4- was quenched by the Eu3+ ion, indicating the existence of efficient energy transfer between the conjugated ligand of EBTC4-/BBTC4- and the Eu3+ ion. Thus, both EBTC4- and BBTC4- are ideal ligands with an "antenna" effect for the Eu3+ ion. The two complexes show the single-ion magnetic behaviors of Eu3+ with strong spin-orbit coupling interactions even if there are shorter distances (5.714 Å for 1versus 4.275 and 5.360 Å for 2) between the neighboring Eu3+ ions connected by oxygen atoms of the tetracarboxylates.
AB - Two novel lanthanide coordination polymers, [Eu2(EBTC)(DMF) 5(NO3)2]·DMF (1) and [Eu 2(BBTC)1.5(CH3OH)2(H 2O)2]·7DMF·HNO3 (2) (EBTC 4- = 1,1′-ethynebenzene-3,3′,5,5′-tetracarboxylate; BBTC4- = 1,1′-butadiynebenzene-3,3′,5,5′- tetracarboxylate), were successfully synthesized from conjugated ligands of EBTC4- and BBTC4-. Although the two tetracarboxylate ligands have similar structures, their different rigidity/flexibility results in quite different networks upon complexation. Complex 1 has a two-dimensional (2-D) layered structure with two crystallographically independent Eu 3+ ions, one in a distorted monocapped square-antiprism and the other in a distorted square-antiprism coordination geometry. Complex 2 exhibits a three-dimensional (3-D) porous framework, with one type of Eu3+ in a distorted square-antiprism and the other in a trigondodecahedron environment. Both 1 and 2 emit the intensely red characteristic luminescence of Eu 3+ ion at room temperature, with a long lifetime of up to 1.3 and 0.7 ms, respectively, during which the ligand emission of EBTC4-/ BBTC4- was quenched by the Eu3+ ion, indicating the existence of efficient energy transfer between the conjugated ligand of EBTC4-/BBTC4- and the Eu3+ ion. Thus, both EBTC4- and BBTC4- are ideal ligands with an "antenna" effect for the Eu3+ ion. The two complexes show the single-ion magnetic behaviors of Eu3+ with strong spin-orbit coupling interactions even if there are shorter distances (5.714 Å for 1versus 4.275 and 5.360 Å for 2) between the neighboring Eu3+ ions connected by oxygen atoms of the tetracarboxylates.
UR - http://www.scopus.com/inward/record.url?scp=80052775689&partnerID=8YFLogxK
U2 - 10.1039/c1dt10693g
DO - 10.1039/c1dt10693g
M3 - 文章
AN - SCOPUS:80052775689
SN - 1477-9226
VL - 40
SP - 9490
EP - 9497
JO - Dalton Transactions
JF - Dalton Transactions
IS - 37
ER -