scholarly journals A new ligand skeleton for imaging applications with d–f complexes: combined lifetime imaging and high relaxivity in an Ir/Gd dyad

2015 ◽  
Vol 51 (42) ◽  
pp. 8833-8836 ◽  
Author(s):  
Atanu Jana ◽  
Elizabeth Baggaley ◽  
Angelo Amoroso ◽  
Michael D. Ward
Keyword(s):  
Energy Transfer ◽  
Magnetic Resonance ◽  
Dinuclear Complexes ◽  
Time Resolved ◽  
Luminescence Imaging ◽  
Lifetime Imaging ◽  
High Relaxivity

The rigid dinuclear complexes Ir·Ln (Ln = Eu, Gd) show potential for use in dual magnetic resonance + time-resolved luminescence imaging (Ir·Gd) and d → f energy-transfer (Ir·Eu).

Highly emissive phosphorescence nanoparticles sensitized by a TADF polymer for time-resolved luminescence imaging

2020 ◽  
Vol 4 (8) ◽  
pp. 2389-2397
Author(s):  
Li Xu ◽  
Jin Wang ◽  
Qingqing Luo ◽  
Guangcai Chen ◽  
Fan Ni ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Time Resolved ◽  
Luminescence Imaging ◽  
Highly Efficient

Highly efficient phosphor nanoparticles were prepared with energy transfer from TADF polymer to Ir complex. These nanoparticles exhibited good dispersibility and biocompatibility, which were then used in time-resolved luminescence bioimaging.

Electronic energy transfer in dinuclear metal complexes containing meta-substituted phenylene units

2005 ◽  
Vol 77 (6) ◽  
pp. 1035-1050 ◽  
Author(s):  
A. D’Aléo ◽  
S. Welter ◽  
E. Cecchetto ◽  
L. De Cola
Keyword(s):  
Energy Transfer ◽  
Steady State ◽  
Metal Complexes ◽  
Photophysical Properties ◽  
Electronic Energy ◽  
Dinuclear Complexes ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Electronic Energy Transfer ◽  
Dinuclear Metal Complexes

The synthesis and photophysical properties of heterometallic dinuclear complexes based on ruthenium and osmium trisbipyridine units, Ru-mPh3-Os and Ru-mPh5-Os, in which the metal complexes are linked via an oligophenylene bridge centrally connected in the meta position, are described. Electronic energy transfer from the excited ruthenium-based component (donor) to the osmium moiety (acceptor) has been investigated using steady-state and time-resolved spectroscopy. The results obtained for the meta-substituted compounds are compared with the analogous systems in which the phenylene spacers are substituted in the para position. The mechanism of energy transfer is discussed.

Fabrication of Eu-doped Gd(OH)3 Nanorods with Enhanced Magnetic- Resonance and Luminescence Imaging

2017 ◽  
Vol 14 (3) ◽  
pp. 342-348 ◽  
Author(s):  
Yuanwen Zou ◽  
Zhi Wu ◽  
Zhongbing Huang ◽  
Guangfu Yin ◽  
Lei Wang ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Luminescence Imaging

scholarly journals A Gadolinium(III) Complex Based on the Thymine Nucleobase with Properties Suitable for Magnetic Resonance Imaging

2021 ◽  
Vol 22 (9) ◽  
pp. 4586
Author(s):  
Marta Orts-Arroyo ◽  
Amadeo Ten-Esteve ◽  
Sonia Ginés-Cárdenas ◽  
Isabel Castro ◽  
Luis Martí-Bonmatí ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Mr Imaging ◽  
Lesion Detection ◽  
Resonance Imaging ◽  
X Ray Diffraction ◽  
Functional Images ◽  
High Relaxivity ◽  
Contrast Enhanced ◽  
Phantom Studies

The paramagnetic gadolinium(III) ion is used as contrast agent in magnetic resonance (MR) imaging to improve the lesion detection and characterization. It generates a signal by changing the relaxivity of protons from associated water molecules and creates a clearer physical distinction between the molecule and the surrounding tissues. New gadolinium-based contrast agents displaying larger relaxivity values and specifically targeted might provide higher resolution and better functional images. We have synthesized the gadolinium(III) complex of formula [Gd(thy)2(H2O)6](ClO4)3·2H2O (1) [thy = 5-methyl-1H-pyrimidine-2,4-dione or thymine], which is the first reported compound based on gadolinium and thymine nucleobase. 1 has been characterized through UV-vis, IR, SEM-EDAX, and single-crystal X-ray diffraction techniques, and its magnetic and relaxometric properties have been investigated by means of SQUID magnetometer and MR imaging phantom studies, respectively. On the basis of its high relaxivity values, this gadolinium(III) complex can be considered a suitable candidate for contrast-enhanced magnetic resonance imaging.

scholarly journals Time-Resolved Measurements and Master Equation Modelling of the Unimolecular Decomposition of CH3OCH2

2020 ◽  
Vol 234 (7-9) ◽  
pp. 1233-1250 ◽  
Author(s):  
Arrke J. Eskola ◽  
Mark A. Blitz ◽  
Michael J. Pilling ◽  
Paul W. Seakins ◽  
Robin J. Shannon
Keyword(s):  
Energy Transfer ◽  
Master Equation ◽  
Rate Coefficient ◽  
Zero Point ◽  
Buffer Gas ◽  
Unimolecular Decomposition ◽  
Time Resolved ◽  
Point Energy ◽  
Wide Range ◽  
Transfer Parameters

AbstractThe rate coefficient for the unimolecular decomposition of CH3OCH2, k1, has been measured in time-resolved experiments by monitoring the HCHO product. CH3OCH2 was rapidly and cleanly generated by 248 nm excimer photolysis of oxalyl chloride, (ClCO)2, in an excess of CH3OCH3, and an excimer pumped dye laser tuned to 353.16 nm was used to probe HCHO via laser induced fluorescence. k1(T,p) was measured over the ranges: 573–673 K and 0.1–4.3 × 1018 molecule cm−3 with a helium bath gas. In addition, some experiments were carried out with nitrogen as the bath gas. Ab initio calculations on CH3OCH2 decomposition were carried out and a transition-state for decomposition to CH3 and H2CO was identified. This information was used in a master equation rate calculation, using the MESMER code, where the zero-point-energy corrected barrier to reaction, ΔE0,1, and the energy transfer parameters, ⟨ΔEdown⟩ × Tn, were the adjusted parameters to best fit the experimental data, with helium as the buffer gas. The data were combined with earlier measurements by Loucks and Laidler (Can J. Chem.1967, 45, 2767), with dimethyl ether as the third body, reinterpreted using current literature for the rate coefficient for recombination of CH3OCH2. This analysis returned ΔE0,1 = (112.3 ± 0.6) kJ mol−1, and leads to $k_{1}^{\infty}(T)=2.9\times{10^{12}}$ (T/300)2.5 exp(−106.8 kJ mol−1/RT). Using this model, limited experiments with nitrogen as the bath gas allowed N2 energy transfer parameters to be identified and then further MESMER simulations were carried out, where N2 was the buffer gas, to generate k1(T,p) over a wide range of conditions: 300–1000 K and N2 = 1012–1025 molecule cm−3. The resulting k1(T,p) has been parameterized using a Troe-expression, so that they can be readily be incorporated into combustion models. In addition, k1(T,p) has been parametrized using PLOG for the buffer gases, He, CH3OCH3 and N2.

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