𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The Synthesis, Photophysical Characterization, and X-Ray Structure Analysis of Two Polymorphs of 4,4′-Diacetylstilbene

✍ Scribed by Cameron Pye; Frank R. Fronczek; Ralph Isovitsch

Publisher
John Wiley and Sons
Year
2010
Tongue
German
Weight
230 KB
Volume
93
Category
Article
ISSN
0018-019X

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

A palladium(II) acetate‐catalyzed synthesis of 1 that utilizes the novel triazene 1‐{4‐[(E)‐morpholin‐4‐yldiazenyl]phenyl}ethanone as a synthon is described. The room temperature absorption spectra of 1 in various solvents exhibited a π→π* transition in the range of 330–350 nm. Compound 1 was observed to be luminescent, with room‐temperature solution and solid‐state emission spectra that exhibited maxima in the range 400–500 nm. All room‐temperature absorption and emission spectra exhibited some degree of vibrational structure. The emission spectrum of 1 at 77 K in propanenitrile glass was broad and featureless with a maximum at 447 nm. Compound 1 crystallized as a yellow and colorless polymorph. X‐Ray structure analyses of both of these polymorphs and 1‐{4‐[(E)‐morpholin‐4‐yldiazenyl]phenyl}ethanone are presented.

📜 SIMILAR VOLUMES

The synthesis, X-ray structure analysis,
The synthesis, X-ray structure analysis, and photophysical characterization of 4-[(E)-2-(4-cyanophenyl)diazenyl]-morpholine
✍ Taylor Chin; Ashley Phipps; Frank R. Fronczek; Ralph Isovitsch 📂 Article 📅 2010 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 110 KB

## Abstract A novel triazene, 4‐[(__E__)‐2‐(4‐cyanophenyl)diazenyl]‐morpholine (**1**) was prepared via a diazonium ion coupling reaction between 4‐aminobenzonitrile and morpholine. The x‐ray structure of **1** was determined and evidenced π delocalization in the triazene subunit. The room temperat

Structure of [4.4.4]propellane and [4.4.
Structure of [4.4.4]propellane and [4.4.4]propellatriene by X-ray Analysis
✍ O. Ermer; R. Gerdil; J. D. Dunitz 📂 Article 📅 1971 🏛 John Wiley and Sons 🌐 German ⚖ 643 KB

## Abstract The crystal structures of [4.4.4]propellane (monoclinic, __a__=12.053, __b__=7.832, __c__=13.001 Å, β=104.89°, space group __C__2/__c__, __Z__=4) and [4.4.4]propellatriene (monoclinic, __a__=7.876, __b__=12.651, __c__=13.164 Å, β=122.81°, space group __P__2~1~/__c__,__Z__=4) have been d

The X-Ray and Electronic Structures of G
The X-Ray and Electronic Structures of GdB4.
✍ Maria Teresa Garland; Juan Paulo Wiff; Josef Bauer; Roland Guerin; Jean-Yves Sai 📂 Article 📅 2003 🏛 John Wiley and Sons ⚖ 57 KB

## Abstract For Abstract see ChemInform Abstract in Full Text.

X-ray crystallographic analysis and diff
X-ray crystallographic analysis and differential scanning calorimetry of two polymorphic forms of 2,6-diphenyl-1,4-dithiin
✍ Xuehua Piao; Yoshiaki Sugihara; Juzo Nakayama 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 142 KB

## Abstract 2,6‐Diphenyl‐1,4‐dithiin **2** exists in the two polymorphic forms. The dithiin **2L**, mp 62–63°C, was assigned as the metastable form, while the dithiin **2H**, mp 79–80°C, was assigned as the stable form, mainly on the basis of differential scanning calorimetry (DSC) analysis. X‐Ray

Solid state characterization and crystal
Solid state characterization and crystal structure from X-ray powder diffraction of two polymorphic forms of ranitidine base
✍ Héctor Novoa de Armas; Oswald M. Peeters; Norbert Blaton; Elke Van Gyseghem; Joh 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 393 KB

Ranitidine hydrochloride (RAN-HCl), a known anti-ulcer drug, is the product of reaction between HCl and ranitidine base (RAN-B). RAN-HCl has been extensively studied; however this is not the case of the RAN-B. The solid state characterization of RAN-B polymorphs has been carried out using different