Electronic Spectroscopy of a C7H4+ Isomer in a Neon Matrix: Methyltriacetylene Cation

2014 ◽  
Vol 67 (3) ◽  
pp. 416 ◽  
Author(s):  
Arghya Chakraborty ◽  
Jan Fulara ◽  
John P. Maier
Keyword(s):  
Fluorescence Spectra ◽  
Spectroscopic Analysis ◽  
Laser Excitation ◽  
Electronic Spectroscopy ◽  
Ion Source ◽  
Electronic Transitions ◽  
Mass Selection ◽  
Absorption And Fluorescence Spectra ◽  
Excitation Energies ◽  
Vibrational Bands

Absorptions commencing at 602.6 nm are detected following deposition of mass-selected C7H4+ in a 6 K neon matrix produced from a 1 : 1 mixture of diacetylene and propyne in an ion source. The 602.6 nm system, and a weaker one near 421.1 nm, are assigned to the A 2E ← X 2E and B 2E ← X 2E electronic transitions of methyltriacetylene cation (C3V symmetry), based on mass-selection, spectroscopic analysis of the vibrational structure, and the excitation energies calculated with CASPT2. Structured fluorescence is detected in the 600–760 nm range upon laser excitation at wavelengths of the CH3C6H+ absorptions. The vibrational bands observed in the absorption and fluorescence spectra are assigned with the aid of calculated frequencies of the totally symmetric (a1) vibrations of methyltriacetylene cation.

Synthesis, Spectroscopic Properties of Bis-Boc-L-Alanine Modified 1,8-Naphthyridine Ligand Induced by Hg2+

2015 ◽  
Vol 1089 ◽  
pp. 121-124
Author(s):  
Gao Zhang Gou ◽  
Bo Zhou ◽  
Ling Shi ◽  
Xian Lan Chen ◽  
Na Wu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Mirror Symmetry ◽  
Heavy Metal Ions ◽  
Fluorescence Spectra ◽  
Electronic Absorption Spectra ◽  
Emission Spectra ◽  
Spectroscopic Properties ◽  
Ion Source ◽  
Absorption And Fluorescence Spectra ◽  
Comprehensive Study

One Bis-Boc-L-alanine-1,8-naphthyridine ligand containing amino acid by amido bond named 2,7-Bis-Boc-L-alanine-1,8-naphthyridine (L1) was synthesized and characterized. And there absorption and fluorescence spectra in methanol is presented. It exhibits electronic absorption spectra with λmax at about 340 nm, which can be tentatively assigned to π→π* transition. The emission spectra of L1 in CH3OH shows a mirror symmetry peak with λmax at about 375 nm. Then, the comprehensive study of spectroscopic properties upon titration of L1 with heavy metal ions as ion source in CH3OH was investigated.

Electronic Spectroscopy of Mixed Cyclophanes: [2.2](9,10)Anthracenometacyclophane, [2.2](9,10) and [3.3](9,10)-Anthracenoparacyclophane

1989 ◽  
Vol 42 (12) ◽  
pp. 2215 ◽  
Author(s):  
J Ferguson ◽  
M Puza ◽  
RJ Robbins ◽  
GJ Wilson
Keyword(s):  
Absorption Spectra ◽  
Strong Interaction ◽  
Fluorescence Spectra ◽  
Electronic Spectroscopy ◽  
Absorption And Fluorescence Spectra ◽  
Absorption Bands

The absorption and fluorescence spectra of the title compounds are reported and a simple coupled chromophore model has been used to make assignments of the absorption bands. The absorption spectra show a strong interaction between the 1Lb state of the anthracene chromophore and the 1Lb state of the benzene chromophore in both anthracenoparacyclophanes which is absent in [2.2](9,10) anthracenometacyclophane. The fluorescence comes from the 1La state of the anthracene chromophore.

Dye laser and thermal emission spectroscopy of the TbO molecule

1984 ◽  
Vol 62 (12) ◽  
pp. 1855-1870 ◽  
Author(s):  
N. Kulikov ◽  
L. A. Kaledin ◽  
A. I. Kobyliansky ◽  
L. V. Gurvich
Keyword(s):  
Fluorescence Detection ◽  
Ground State ◽  
Emission Spectroscopy ◽  
Fluorescence Spectra ◽  
Laser Excitation ◽  
Thermal Emission ◽  
Rotational Structure ◽  
Electronic Transitions ◽  
Rotational Constants ◽  
Thermal Emission Spectroscopy

The rotational structure of six bands of the TbO molecule, including the 0–0 bands of electronic transitions III, IV, and V, was analyzed using laser excitation spectroscopy with selective fluorescence detection. From the fluorescence spectra obtained through excitation of selected rotational lines in these bands, the energies of 14 low-lying Ω states as well as ΔG1/2 values for the four lowest Ω states were determined. The values of Ω and rotational constants B and D were found for each, low-lying state and the upper states of the analyzed bands; an energy linkage for all the electronic transitions, whose rotational structure has been analyzed, is established. The ground state constants of TbO are (2σ—uncertainty in parentheses) Ω = 6.5, B0 = 0.3525(1) cm−1, D0 = 1.8(2) × 10−7 cm−1, ΔG1/2 = 837.1(1) cm−1, α = 1.5(1) × 10−3 cm−1.

Electronic Spectroscopy of Mixed Cyclophanes: [2.2](9,10)Anthraceno(1,4)naphthalenophane

1989 ◽  
Vol 42 (12) ◽  
pp. 2201 ◽  
Author(s):  
J Ferguson ◽  
RJ Robbins ◽  
GJ Wilson
Keyword(s):  
Absorption Spectrum ◽  
Single Crystal ◽  
Fluorescence Spectrum ◽  
Absorption Spectra ◽  
Fluorescence Polarization ◽  
Fluorescence Spectra ◽  
Electronic Spectroscopy ◽  
Absorption And Fluorescence Spectra ◽  
Absorption Bands ◽  
Absorption Intensity

The absorption and fluorescence spectra of [2.21(9,10) anthraceno (1,4) naphthalenophane are reported. The anisotropy of the absorption bands was measured by two methods, ( i ) from fluorescence polarization ratios in a rigid glass and (ii) from single crystal absorption spectra at 23 K. The two states arising from the 1La states of the two chromophores were identified together with two states arising from other chromophore 1B2u states. Two states arising from the 1La states of the two chromophores were also identified. Whereas a coupled chromophore model accounts reasonably well for the latter two states, the energies and intensities of the bands arising from 1La chromophore states cannot be reconciled with this approach. Long axis polarized absorption intensity lying under the 1La, bands appears to be vibronically induced and not due to the 1Lb states. The absorption spectrum, fluorescence spectrum and fluorescence polarization ratios of a stable dimer were also observed. Its structure is similar to that of the stable dimer of anthracene in which the molecular long axes are parallel but the short axes make an angle of about 70� with each other.

Synthesis, Spectroscopic Properties of Bis-Boc-L-alanine Modified 1,8-Naphthyridine Ligand Induced by Cr3+

2014 ◽  
Vol 716-717 ◽  
pp. 163-166
Author(s):  
Gao Zhang Gou ◽  
Bo Zhou ◽  
Ling Shi ◽  
Na Wu ◽  
Xian Lan Chen ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Amino Acid ◽  
Metal Ions ◽  
Fluorescent Probe ◽  
Heavy Metal Ions ◽  
Fluorescence Spectra ◽  
Spectroscopic Properties ◽  
Ion Source ◽  
Absorption And Fluorescence Spectra ◽  
Comprehensive Study

One Bis-Boc-L-alanine-1,8-naphthyridine ligand containing amino acid by amido bond named 2,7-Bis-Boc-L-alanine-1,8-naphthyridine (L1) was synthesized and characterized. And there absorption and fluorescence spectra in methanol is presented. Then, the comprehensive study of spectroscopic properties upon titration of L1 with heavy metal ions as ion source in CH3OH was investigated. It shows compound L1 can use as a fluorescent probe for heavy metal ions like Cr3+.

A phthalocyanine-based fluorescent sensor for Zn2+ ion

2013 ◽  
Vol 17 (01n02) ◽  
pp. 99-103 ◽  
Author(s):  
Hui He ◽  
Jian-Yong Liu ◽  
Dennis K.P. Ng
Keyword(s):  
Metal Ions ◽  
Spectral Properties ◽  
Fluorescence Spectra ◽  
Near Infrared ◽  
Fluorescent Sensor ◽  
High Sensitivity ◽  
Absorption And Fluorescence Spectra

This paper describes the preparation and spectral properties of a near-infrared fluorophore in which two bis(2-picolyl)amino moieties are axially linked to a silicon(IV) phthalocyanine core. The effects of various metal ions on its absorption and fluorescence spectra have been examined. The results indicate that this compound shows a high sensitivity and moderate selectivity toward Zn2+ ion.

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