257 research outputs found
Die wahre Glückseeligkeit der Christen in ihrem Leben An dem Exempel des weyland Ehren-Vesten und Wohlgeachteten Herrn Johann Hanack Vornehmen Bürgers und Weiß-Beckers in Wjttenberg wie auch bey selbiger Stadt und Bürgerschafft angesehenen Vierzigers Welcher Nach dem am 20. Aprilis 1718. erfolgten sanfften und seeligen Hintritt den 25. darauf mit Christlichen Ceremonien zu seiner Ruhestatt gebracht wurde/ Jn einer Gedächtnüß-Rede Vorgestellet von M. Christian Bernhard Büchern Der Philosophischen Facultät daselbst Assessore
No full textTrauerschrift auf Johann Hanack, Weißbäcker in Wittenberg, gestorben am 20. April 1718Die Rückseite des Titelblatts ist unbedrucktVorlageform der Veröffentlichungsangabe: Wittenberg, gedruckt mit Gerdesischer Wittwe Schrifften. - Erscheinungsdatum nach Datierung im Titel bestimm
Physical properties of phthalocyanine based materials
No full textCHAPTER ORGANIZATION
1,2-Definitions of physical properties of Pcs
3- Structural features
a) Molecular geometries
b) Spatial arrangements of molecules
4-Electronic structure of Pcs
a) Electrons in p-type orbitals of gaseous species
b) Electrons in low lying energy states of gaseous species
c) Electronic structure in solid Pcs
5-Optical absorption of Pcs
6-Electrical conduction in Pcs
7-Photoconduction in Pcs
8-Nonlinear optical (NLO) properties
a) Introduction
b) Optical limiting (OL)
c) Pcs for OL
d) NLO of crystal
Nonlinear optical properties of tetrapyrazinoporphyrazinato indium chloride complexes due to excited-state absorption processes
No full textThe multiphoton absorption properties of the axially substituted tetrapyrazinotetraazaporphyrinato complex
Pyz4TAPInCl (1) are reported and interpreted. In particular, the nonlinear optical transmission of the complex
and the excited states involved in the nonlinear absorption have been determined at the frequency of the
second harmonic generation of a Nd:YAG laser in the nanosecond time regime. Pyz4TAPInCl has an excitedstate
absorption cross section larger than its ground state in the 460-540 nm spectral region, and it shows an
optical limiting (OL) behavior at 532 nm, which derives from a sequential two-photon absorption with a
larger absorption cross section of the excited triplet state with respect to the ground state. It results that the
absorption cross section of 1 in the excited triplet state is 7.8 10-18 cm2 vs 0.9 10-18 cm2 of the ground
state at the wavelength of OL analysis
Excited state properties of monomeric and dimeric axially bridged indium phthalocyanines upon UV-Vis laser irradiation
No full textThis contribution presents a series of results from different photophysical experiments realized at both resonance and off-resonance conditions on a group of newly synthesized cofacial bridged phthalocyanines. The most relevant aspect of the present study is the identification of a common photoexcited state, which can be reached by the same compound via two substantially different irradiation pathways
Indium phthalocyanines with different axial ligands: A study of the influence of the structure on the photophysics and optical limiting properties.
No full textThe photophysical properties of four axially substituted indium phthalocyanines, namely, 2,(3)-tetra-tertbutyl-
phthalocyaninato indium chloride (1), 2,(3)-tetra-[(3,5-di-tert-butyl)-phenyloxy]-phthalocyaninato indium
bromide (2), 2,(3)-tetra-[(3,5-di-tert-butyl)-phenyloxy]-phthalocyaninato indium iodide (3), and 2,3-octa-[(2-
hexyl)-ethyloxy]-phthalocyaninato indium trifluoroacetate (4), have been investigated, and their optical limiting
properties with nanosecond light pulses were evaluated. All complexes behave as reverse saturable absorbers
in the range of 400-625 nm due to a triplet-triplet excited-state transition. Excited-state absorption cross
sections and triplet state lifetimes are not significantly affected by the nature of the axial ligand. On the other
hand, remarkable differences in the variation of nonlinear transmittance are observed for 1-4 due to significantly
different intersystem crossing rates. Heavier axial ligands in phthalocyanines 2 and 3 produce the largest
variations of nonlinear transmission (heavy-atom effect). Complex 1 in polystyrene matrix shows reversible
nonlinear absorption when incident fluence does not exceed 0.025 J cm-2
Optical limiting of transition metal-phthalocyanine complexes: A photochromic effect involving the excited state of the conjugated molecule
No full text10.1080/15421400590947423Molecular Crystals and Liquid Crystals431259/[559]-274/[574]MCLC
Nonlinear optical effects related to saturable and reverse saturable absorption by subphthalocyanines at 532 nm
No full textIt is found that both effects of saturable absorption and reverse
saturable absorption are obtained with a solution of subphthalocyanine
2 at 532 nm depending on the intensity of 9 ns laser
pulses; saturable absorption occurs at lower intensity levels
whereas the reverse effect prevails at higher levels; contrary to
expectations, subphthalocyanines can behave as reverse saturable
absorbers at 532 nm, despite the high linear absorption at
this wavelength; data have been fitted with a five-level model
which considers three consecutive electronic transitions with
absorption cross-section values of 1.4610216, 1.0610216 and
40 6 10216 cm2, respectively
Demonstration of the optical limiting effect for an hemiporphyrazine
No full textThe hemiporphyrazine complex 9,22-bis(dibutoxy)hemiporphyrazinato
chloroindium(III) (1) is one of the few examples
for this class of compounds, which displays the nonlinear
optical effect of reverse saturable absorption for nanosecond
laser pulses in the visible spectrum. The high linear transmission
combined with the fast switching into a strongly absorbing
excited state in the same spectral range (400–650 nm), renders
the studied hemiporphyrazine an ideal material for the passive
shuttering of pulsed radiations
Large two-photon absorption cross sections of hemiporphyrazines in the excited state: The multiphoton absorption process of hemiporphyrazines with different central metals
No full textA series of five hemiporphyrazines (Hps) with different coordinating central atoms (H2, GeCl2, InCl, Pt, Pb), and the acyclic derivative 1,3-bis-(6′-amino-4′-butoxy-2′-pyridylimino)-1,3-dihydroisoindoline have been synthesized and their multiphoton absorption properties examined at the second harmonic frequency of the Nd:YAG laser in the nanosecond time regime. Metal-free and platinum Hps display saturation of optical transmittance within incident fluence values of 6 J cm−2. Comparison with other similar molecular structures like phthalocyanines and related molecules shows that Hps are strong nonlinear absorbers. The experimental curves of nonlinear transmission at 532 nm have been fitted by means of a three-level model with the occurrence of simultaneous two-photon absorption from an excited state. In the sole case of the InCl complex we found that a five-level model is needed because of the participation of triplet states. Contrary to phthalocyanines, naphthalocyanines, and porphyrins, a heavy central atom does not improve the nonlinear absorption properties since a different excited states dynamic is involved. The large nonlinear absorption of Hps combined with the very small absorption in the visible spectral range makes these molecules a very interesting class of molecules for nonlinear optical applications
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