Μελέτη της φωτοδιάσπασης οργανοπυριτικών παραγώγων του ναφθαλενικού χρωμοφόρου (Master thesis)

Λάμπογλου, Νικόλαος

The photochemistry research group in Ioannina has focused for years his efforts in the photochemistry of benzylic organosilicon compounds; Two major results have been found: (1) chromophores facilitating the transition to triplet excited states T1 (e.g., carbonyl-chromophores) undergo photodegradation to the corresponding radicals (bond cleavage C-Si), while (2) chromophores facilitating the transition to singlet excited states S1 (e.g. phenyl-chromophores) give rearrangement products (metathesis) of the photo-Fries type.8, 10 In the present study, we are dealing with compounds having the naphthalene chromophore (NA): 1-Me3SiCH2-NA (I) and 1-(Me3Si)2CH-NA (II). The results of our studies using various methods (1H- & 13C-NMR, IR, UVVIS, Laser Flash Photolysis (LFP), HPLC analytical), are in line with the photodissociation of the C-Si bond via the triplet excited state (T1); The T1 state of II has been monitored via LFP as well as its dissociation product 1naphthylmethyl radical. Subsequently, the radicals react with the atmospheric O2 forming finally 1-naphthaldehyde and 1-naphthalenemethanol and in the case of absence of O2 (Argon atmosphere) 1,1-ethylene-dinaphthalene (see the Scheme below). No photometathesis products of the type of the photoFies reaction have been idedified.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
Subject classification: Φωτοχημεία
Keywords: Φωτοχημεία,Φωτοδιάσπαση,Ναφθαλένιο,Σιλάνια
URI: https://olympias.lib.uoi.gr/jspui/handle/123456789/29173
http://dx.doi.org/10.26268/heal.uoi.2919
Appears in Collections:Διατριβές Μεταπτυχιακής Έρευνας (Masters)

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