Low temperature polymerizations of 3,6-diamino-9-ethylcarbazole (1 b) with the diacyl dichlorides 2 a -e were investigated. In all cases polyamides of high relative molecular mass ( [ q ] = 1 .lo2 cm3 g-'). could be obtained. These polyamides are polymeric electron donors in which the donor units are arranged with regular intervals. Donor acceptor interactions between polyamides and 1,3,54rinitrobenzene were studied. In comparison with the monomeric model compound 9-ethyl-3,6-bis(propionylamino)carbazole (lc) the polymer donor showed a higher stability constant. However, there is no regularity in the sequence of stability constants in respect to the number of methylene units separating two carbazole groups. There is a possibility that donor units in the polymer molecules might be located in such a way that each donor unit could cooperate to form a donor-acceptor complex. N o specific interactions between the carbazole groups could, however, be detected by fluorescence spectroscopy. The importance of solvent effects was expressed by the results of absorption and emission spectroscopy. Z U S A M M E N F A S S U N G :Tieftemperatur-Polymerisationen von 3,6-Diamino-9-athylcarbazoI (1 b) mit den Diacyldichloriden 2 a -e wurden untersucht. In allen Fallen wurden Polyamide mit hoher rel. mol.Masse ( [ v ] = 1 .lo2 cm3 g-') erhalten. Die Polyamide erwiesen sich als polymere Elektronendonatoren, in denen die Donator-Einheiten in regelmaoigen Abstanden angeordnet sind. Donator-Acceptor-Wechselwirkungen zwischen Polyamiden und 1,3,5-Trinitrobenzol wurden untersucht. Im Vergleich zur monomeren Modellsubstanz, dem 9-Athyl-3,6-bis@ropionyl amino)carbazol (1 c) zeigten die polymeren Donatoren eine hohere Stabilitatskonstante. Es besteht jedoch keine RegelmaRigkeit in der Folge der Stabilitatskonstanten im Hinblick auf die Zahl der Methylen-Einheiten, die die Carbazolgruppen trennen. Es ist moglich, daB die Donator-Einheiten in den Polymer-Molekiilen derart angeordnet sind, daR jede Donator-Einheit am Aufbau eines Donator-Acceptor-Komplexes beteiligt ist. Spezifische Wechselwirkungen zwischen den Carbazolgruppen konnten mit Hilfe der Fluoreszenz-Spektroskopie nicht festgestellt werden. Die Ergebnisse der Absorptions-und Emissionsspektroskopie bringen die Bedeutung von Losungsmitteleffekten zurn Ausdruck.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.