Phthalocyanines-based photoacoustic contrast agents for imaging and theranostics

2021 ◽  
Author(s):  
Bing-De Zheng ◽  
Jing Ye ◽  
Yayan Huang ◽  
Meitian Xiao
Keyword(s):  
Absorption Coefficient ◽  
Contrast Agents ◽  
Near Infrared ◽  
Organic Dye ◽  
Molar Absorption Coefficient

Phthalocyanine, as an organic dye, has attracted much attention due to its high molar absorption coefficient in the near-infrared (NIR) region. It is precisely because of this advantage that phthalocyanine...

FT-near-IR and FT-IR Studies of Cis-9-Octadecen-1-ol: Molar Absorption Coefficient of a Band Due to the First Overtone of the Stretching Mode of the Terminal OH Group and Comparison of Anharmonicity of an OH Stretching Mode among the Monomeric and Associated Species

1995 ◽  
Vol 49 (11) ◽  
pp. 1661-1668 ◽  
Author(s):  
Yongliang Liu ◽  
Hisashi Maeda ◽  
Yukihiro Ozaki ◽  
Mirosław A. Czarnecki ◽  
Masao Suzuki ◽  
...  
Keyword(s):  
Absorption Coefficient ◽  
Near Infrared ◽  
Molar Absorption Coefficient ◽  
Open Chain ◽  
Oh Groups ◽  
Ir Studies ◽  
Near Ir ◽  
Ft Ir ◽  
Self Association ◽  
Associated Species

Fourier transform near-infrared (FT-near-IR) and FT-IR spectra have been measured for cis-9-octadecen-1-ol in CCl4 solutions at various concentrations and temperatures partly to investigate its self-association and partly to explore its near-IR spectrum. Both spectra have demonstrated the appearances of bands due to free terminal OH groups of the linear dimer (open-chain dimer) and oligomer of the alcohol. They are observed at 3621 and 7070 cm−1 in the IR and near-IR regions, whose frequencies are lower by 16 and 34 cm−1, respectively, than those of the corresponding bands due to a free OH group of the monomer. The spectral changes in both regions suggest that (1) at concentrations below 0.10 M, the alcohol exists mostly as the monomer and dimer, and with increasing temperature the dimer dissociates into the monomer; and (2) as the concentration is increased, it associates to form aggregates (such as tetramer), and with temperature increase the aggregates dissociate into the dimer and monomer. The molar absorption coefficient of the band due to the first overtone of the stretching mode of the terminal OH groups has been determined to be 0.139 dm3 mol−1 cm−1. It is approximately 8% of that of the first overtone of the monomeric OH group (1.63 dm3 mol−1 cm−1). The anharmonicity of an OH stretching mode of the alcohol has been investigated for various OH groups, free, terminal, and hydrogen-bonded, by comparing the frequencies of the bands due to the OH stretching modes with those of the bands due to the corresponding first overtones. The anharmonicity of the stretching mode of the terminal OH groups of the associated species is very similar to that for the free OH group of the monomer.

Carbon dioxide in pollucite, a feldspathoid with the ideal composition (Cs, Na)16Al16Si32O96·nH2O

2012 ◽  
Vol 76 (4) ◽  
pp. 903-911 ◽  
Author(s):  
F. Bellatreccia ◽  
G. Della Ventura ◽  
G. D. Gatta ◽  
M. Cestelli Guidi ◽  
S. Harley
Keyword(s):  
Absorption Coefficient ◽  
Single Crystal ◽  
Near Infrared ◽  
Secondary Ion Mass Spectrometry ◽  
Infrared Region ◽  
Sharp Peak ◽  
Molar Absorption Coefficient ◽  
X Ray Diffraction ◽  
Bending Vibration ◽  
Ideal Composition

AbstractWe report a single-crystal Fourier-transform infrared (FTIR) study of a sample of pollucite from Maine, USA. Prior to our work, the sample had been characterized by single-crystal X-ray diffraction, neutron diffraction and electron-probe microanalysis. It is cubicIa3d, with a crystal-chemical formula Na1.93(Cs10.48Rb0.31K0.04)Σ=10.83(Al14.45Si33.97)Σ=48.42O96·3.92H2O, and an H2O content, determined by thermogravimetric analysis, of 1.6 wt.%. The single-crystal FTIR spectrum has a doublet of intense bands at 3670 and 3589 cm–1, which are assigned to the ν3and ν1stretching modes of the H2O molecule, respectively. A very intense and sharp peak at 1620 cm–1is assigned to the ν2bending vibration. In the near-infrared region there is a relatively intense peak at 5270 cm–1, which is assigned to a combination (ν2+ ν3) mode of H2O, and a weak but well defined doublet at 7118 and 6831 cm–1, which is assigned to the first overtones of the fundamental stretching modes. A relatively weak but extremely sharp peak at 2348 cm–1shows that the pollucite contains CO2molecules in structural cavities. Mapping the sample using FTIR indicates that both H2O and CO2are homogeneously distributed. Secondary ion mass spectrometry yielded an average CO2content of 0.09±0.02 wt.%. On the basis of this value, we determined the integrated molar absorption coefficient for the spectroscopic analysis of CO2in pollucite to be εiCO2= 11,000±3000 l mol–1cm–2; the linear molar absorption coefficient for the same integration range is εlCO2= 1600±500 l mol–1cm–1.

scholarly journals Recent development of near-infrared photoacoustic probes based on small-molecule organic dye

2021 ◽  
Author(s):  
Chonglu Li ◽  
Chang Liu ◽  
Yifan Fan ◽  
Xin Ma ◽  
Yibei Zhan ◽  
...  
Keyword(s):  
Small Molecule ◽  
Near Infrared ◽  
Organic Dye

In this review, we discuss the recent development of near-infrared photoacoustic probes based on small molecule dyes, which focus on their “always on” and “activatable” form in biomedicine.

Ultrasensitive UV-NIR Broadband Phototransistors Based on AgBiS2-organic Hybrid Films

2021 ◽  
Author(s):  
Li Jiang ◽  
Huihuang Huang ◽  
Fubing Gui ◽  
Yalun Xu ◽  
Qianqian Lin
Keyword(s):  
Absorption Coefficient ◽  
Near Infrared ◽  
Ultra Violet ◽  
Hybrid Films ◽  
Material Stability ◽  
Organic Hybrid

Recent years, AgBiS2 has received great attention in optoelectronics thanks to the fascinated merits, including suitable bandgap, large absorption coefficient from ultra-violet to near-infrared and remarkable material stability. However, the...

scholarly journals Gold Nanoprisms as Optical Coherence Tomography Contrast Agents in the Second Near-Infrared Window for Enhanced Angiography in Live Animals

ACS Nano ◽  
2018 ◽  
Vol 12 (12) ◽  
pp. 11986-11994 ◽  
Author(s):  
Peng Si ◽  
Edwin Yuan ◽  
Orly Liba ◽  
Yonatan Winetraub ◽  
Siavash Yousefi ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Contrast Agents ◽  
Near Infrared ◽  
Optical Coherence ◽  
Gold Nanoprisms ◽  
Infrared Window

scholarly journals Shortwave Infrared Imaging with J-Aggregates Stabilized in Hollow Mesoporous Silica Nanoparticles

2018 ◽  
Author(s):  
Wei Chen ◽  
ChiAn Cheng ◽  
Emily Cosco ◽  
Shyam Ramakrishnan ◽  
Jakob Lingg ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Contrast Agents ◽  
Silica Nanoparticles ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Mesoporous Silica Nanoparticles ◽  
J Aggregates ◽  
Hollow Mesoporous Silica ◽  
Shortwave Infrared

Tissue is translucent to shortwave infrared (SWIR) light, rendering optical imaging superior in this region. However, the widespread use of optical SWIR imaging has been limited, in part, by the lack of bright, biocompatible contrast agents that absorb and emit light above 1000 nm. J-aggregation offers a means to transform stable, near-infrared (NIR) fluorophores into red-shifted SWIR contrast agents. Here we demonstrate that hollow mesoporous silica nanoparticles (HMSNs) can template the J-aggregation of NIR fluorophore IR-140 to result in nanomaterials that absorb and emit SWIR light. The J-aggregates inside PEGylated HMSNs are stable for multiple weeks in buffer and enable high resolution imaging <i>in vivo</i>with 980 nm excitation.

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