Page 52 - IPCoSME 2021

1 INTERNATIONAL POSTGRADUATE CONFERENCE ON SCIENCE AND MARINE ENVIRONMENT 2021
st
(IPCoSME 2021)
“Environmental Sustainability Enhancement Through the Collaboration of Sciences”

RE-07

THE EFFECT OF SUBSTITUENTS AND ELONGATED CONJUGATION ON THE
ELECTRONIC PROPERTIES OF MONOSUBSTITUTED-ALKOXY CHALCONES

AS POTENTIAL OLEDs CANDIDATURE

SYAHARIL SAIDIN , WAN MOHD KHAIRUL WAN MOHAMED ZIN 1*
1

1 Faculty of Science and Marine Environment, Universiti Malaysia Terengganu 21030, Kuala
Nerus, Terengganu, Malaysia

*Corresponding author email: wmkhairul@umt.edu.my

Abstract: Essentially, the development of chalcones derivatives shows interest in many
optoelectronics devices including Organic Light Emitting Diodes (OLEDs) due to their unique

electronic properties. In general, chalcone consists of two phenyl rings with , -keto-enol

group were modified with addition of substituents and elongation of their molecular
framework. In this contribution, three novel series of chalcones derivatives with different

substituents which display D--D architecture were successfully designed and synthesized.

One of the terminals (D) are trifluoromethyl (CF3) and diphenylamine (C12H11N) while the
other terminal (D) represents the alkoxy chain (OCnH2n+1) (where n: 6, 7, 8) in which stabilized

their molecular structure. The alteration of bond by introducing triple bond (CC) was carried

out in order to elongate the molecule. This combination and modification are believed to
enhance the charge transfers along the molecule to occur efficiently thus increasing their

conductivity of electrical current. The assessments of these series were successfully
characterized by spectroscopic and analytical analyses such as infrared (IR), UV-Visible (UV-

Vis), UV-Fluorescence (UV-FL), Nuclear Magnetic resonance (NMR), thermogravimetric

(TGA), and cyclic voltammetric (CV) analysis. In turn, the HOMO – LUMO energy band gap
was calculated via quantum mechanical theory which proved the value of energy separation in

the range of 3.28 eV to 3.95 eV, to act as semiconductor materials. The evaluation of the
conductivity of these derivatives with voltage up to 200 mV exhibits good performances in IV-

curve measurement and their capability in exhibit electroluminescence behaviour shows a great
potential as OLEDs materials.

Keywords: chalcones, D--D architecture, conductivity, electroluminescence behaviour,

OLEDs

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