Solid state and solution dynamics of pyridine based tetraaza-macrocyclic lanthanide chelates possessing phosphonate ligating functionality (Ln-PCTMB): effect on relaxometry and optical properties.
Solid state and solution dynamics of pyridine based tetraaza-macrocyclic lanthanide chelates possessing phosphonate ligating functionality (Ln-PCTMB): effect on relaxometry and optical properties.
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吡啶基的固态和溶液动力学具有膦酸酯绑扎功能(LN-PCTMB)的大环螯合物(LN-PCTMB):对弛豫和光学特性的影响。
DOI:
10.1021/ic901779k
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发表时间:
2009-12-21
影响因子:
4.6
通讯作者:
Woods, Mark
中科院分区:
文献类型:
--
作者:
Kiefer, Garry E.;Woods, Mark
The macrocyclic ligand 3,6,9-tris(methylenebutyl phosphonic acid)-3,6,9-15-tetraazabicyclo [9.3.1]pentadeca-1(15),11,13-triene (PCTMB) was synthesized and complexes of Eu3+, Tb3+, and Gd3+ studied by X-ray crystallography, luminescence, and relaxometry. In the crystal these complexes are dimeric and possess 8-coordinate Ln3+ centers that are linked by bridging phosphonates. The rigidity introduced by the pyridyl nucleus forces the EuPCTMB and TbPCTMB to adopt a twisted snub disphenoid (TSD) coordination geometry. Examination of the 5D0 → 7F0 luminescent transition of EuPCTMB in the solid state confirmed the existence of a single distinct Eu3+ coordination environment, whereas two Eu3+ coordination environments were observed in aqueous solution. Lifetime analysis of aqueous TbPCTMB solutions determined that q = 0.1 and q = 1.0 for the two coordination environments and Stern-Volmer quenching constants (KSVτ = 1101 M−1, KSVΦ = 40780 M−1) support the presence of a monomer/dimer equilibrium. Relaxivity studies of GdPCTMB in H2O/CH3OH exhibited a concentration dependency (0.02 mM –10.00 mM) ranging from r1 = 7.0 mM−1s−1 to 4.0 mM−1s−1 consistent with the trend observed by luminescence.
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影响因子:
4.6
作者:
DESREUX, JF
通讯作者:
DESREUX, JF
影响因子:
4.6
作者:
KIM, WD;HRNCIR, DC;SHERRY, AD
通讯作者:
SHERRY, AD
影响因子:
2.8
作者:
Bombieri, G.;Marchini, N.;Aime, S.
通讯作者:
Aime, S.
DOI:
10.1039/a703065g
发表时间:
1997-10-07
期刊:
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
影响因子:
--
作者:
Aime, S;Batsanov, AS;Williams, JAG
通讯作者:
Williams, JAG
影响因子:
3.8
作者:
Klimentova, Jana;Vojtisek, Pavel
通讯作者:
Vojtisek, Pavel