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Sains Malaysiana 51(6)(2022):
http://doi.org/10.17576/jsm-2022-5106-16
Kehadiran Interaksi Supramolekul dalam Sebatian Polimer Koordinatan Baharu Terbitan Ligan N,N’-2,6-bis(3-piridilmetil)piridina Dikarboksiamida
(Presence of Supramolecule Interaction in New
Coordination Polimer Compound Derive Ligand N,N’-2,6-bis(3-pyridylmethyl)pyridine Dicarboxyamide)
NAFISAH MANSOR1,*,
NUR SHUHAILA HARYANI HARIS1 & MAISARA ABDUL KADIR1,2
1Fakulti Sains dan Sekitaran Marin, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu Darul Iman, Malaysia
2Kumpulan Penyelidikan Bahan Termaju Nano (ANoMa), Fakulti Sains dan Sekitaran Marin, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu Darul Iman, Malaysia
Diserahkan: 23 Ogos 2021/Diterima: 20 November 2021
ABSTRAK
Kehadiran beberapa interaksi supramolekul seperti ikatan hidrogen dan susunan pi-pi adalah penting bukan sahaja untuk menstabilkan struktur molekul tetapi juga memainkan peranan sebagai molekul perumah. Oleh itu, dalam kajian ini, ligan berasaskan amida yang mempunyai bentuk U iaitu N,N’-2,6-bis(3-piridilmetil)piridina dikarboksiamida (L1) telah digunakan sebagai ligan yang berupaya membentuk ikatan hidrogen dengan anion, dan kajian ini berfokus kepada peranannya dalam keadaan polimer koordinatan. Sebagai permulaan, L1 ditindakbalas dengan beberapa logam peralihan melalui kaedah penyejatan perlahan untuk menghasilkan tiga polimer koordinatan yang baharu. Polimer koordinatan ini mempunyai formula molekul, {[Cd(L1)2(H2O)2](NO3)2.H2O}n (1), {[Cd(L1)2(H2O)2](ClO4)2}n (2) dan {[Co(L1)2(H2O)2](NO3)2}n (3) yang dicirikan melalui analisis unsur, FTIR spektroskopi dan kristalografi sinar-X. Polimer koordinatan 1, 2 and 3 menghablur dalam sistem triklinik dan kumpulan ruang P-1. Konformasi sebatian ini digambarkan sebagai logam-makrosiklik dinuklear yang tersusun seperti rantai leher. L1 didapati bersambung melalui logampusat daripada atom nitrogen, secara berulang-ulang untuk membentuk jaringan satu dimensi. Struktur molekul sebatian baharu ini distabilkan oleh kehadiran ikatan hidrogen intermolekul dan intramolekul,
yang terjadi di kawasan NH amida, serta susunan pi-pi di antara gelang aromatik piridina. Dalam struktur hablur ini juga, jaringan metilina membentuk ikatan hidrogen dengan kaunter anion pada moieti2,6-piridina dikarboksamida, menunjukkan potensi sebagai sebatian penerima anion. Kajian DFT telah dijalankan untuk mengenal pasti tenaga interaksi kompleks.
Kata kunci: Ikatan hidrogen; isomorfus; penerima anion; polimer koordinatan; rantaian; 2,6-piridina dikarboksamida
ABSTRACT
The
presence of several supramolecular interactions such as hydrogen bonds and
pi-pi arrangements are important not only to stabilize the molecular structure,
but also to play a role as a host molecule. Therefore, in this study, an
amide-based ligand that has a U shape namely N,N’-2,6-bis(3-pyridylmethyl)pyridine
dicarboxamide (L1) was
used as a ligand capable of forming hydrogen bonds with anions, and this study
focusing on its role in the coordination polymer state. For a start, L1 was
reacted with several transition metals via a slow evaporation method to produce
three new coordination polymers. This coordination polymer has the molecular
formula, {[Cd(L1)2(H2O)2](NO3)2.H2O}n (1), {[Cd(L1)2(H2O)2](ClO4)2}n (2) dan {[Co(L1)2(H2O)2](NO3)2}n (3) characterized
through elemental analysis, FTIR spectroscopy and X-ray crystallography.
Coordination polymers 1, 2, and 3 crystallize in the triclinic system and the
P-1 space group. The molecular conformation of these compounds is described as
a dinuclear macrocyclic metal arranged like a necklace. L1 was found to connect
through the central metal of the nitrogen atom, repeatedly to form a
one-dimensional network. The molecular structure of this new compound is
stabilized by the presence of intermolecular and intramolecular hydrogen bonds,
which occur in the NH amide region, as well as the pi-pi arrangement between
the pyridine aromatic rings. In this crystal structure as well, the methylene
network forms a hydrogen bond with an anion counter on the 2,6-pyridine
dicarboxamide moiety, indicating the potential of the compound as an anion
acceptor. DFT study is carried out to investigate the interaction energies of
the complexes.
Keywords: Anion receptors; coordination polymers;
hydrogen bond; isomorphous; 2,6-pyridine dicarboxamide
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*Pengarang untuk surat-menyurat; email: maisara@umt.edu.my
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