Malaysian Journal of Analytical Sciences Vol 22 No 1 (2018): 27 - 34

DOI: https://doi.org/10.17576/mjas-2018-2201-04

 

 

 

COMPLEXATION OF 5,5,7,12,12,14-HEXAMETHYL-1,4,8,11-TETRAAZACYCLOTETRADECA-7,14-DIENIUM DIPERCHLORATE WITH COPPER(II) ACETATE MONOHYDRATE IN IONIC LIQUID

 

(Pengkompleksan 5,5,7,12,12,14-Heksametil-1,4,8,11-Tetraazasiklo tetraazadeka-7,14-Dienium Diperklorat dengan Kuprum(II) Asetat Monohidrat dalam Cecair Ionik)

 

Noorhanani M. Ali, Nurzati Amani M. Zaid, Nurul Huda Abd. Karim, Bohari M. Yamin, Nur Hasyareeda Hassan*

 

School of Chemical Sciences and Food Technology,

Faculty of Science and Technology,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

 

^*Corresponding author:  syareeda@ukm.edu.my

 

 

Received: 4 September 2017; Accepted: 19 December 2017

 

 

Abstract

In the previous study, 5,5,7,12,12,14–hexamethyl–1,4,8,11–tetraazacyclotetradeca–7,14–dienium diperchlorate, [Me₆C₁₀H₁₆N₄](ClO₄)₂ formed complex of C₁₆H₃₄N₄OCu(ClO₄)₂ and C₁₆H₃₂N₄Cu(ClO₄)₂ when reacted with copper(II) acetate monohydrate in acetonitrile and aqueous solutions, respectively. However, when the same reaction carried out in 1–butyl–3–methylimidazolium hexafluorophosphate ionic liquid, [Bmim][PF₆], disproportionation took place to give bis(ethylenediamine) bis(perchlorato-O) copper(II) complex, C₄H₁₆N₄Cu(ClO₄)₂. X-ray study showed that the central copper atom was coordinated to two ethylenediamine ligands and two oxygen atoms of perchlorate ions in a distorted octahedral environment. Thermogravimetric Analysis (TGA) study showed the complex decomposition in one spontaneous mass loss at 260 ºC due to the explosive nature of the perchlorate.

 

Keywords:  ionic liquid, disproportionation, copper(II) complex

 

Abstrak

Dalam kajian yang lepas, 5,5,7,12,12,14-heksametil-1,4,8,11-tetraazasiklotetradeka-7,14-dienium diperklorat, [Me₆C₁₀H₁₆N₄](ClO₄)₂  membentuk kompleks C₁₆H₃₂N₄OCu(ClO₄)₂ dan C₁₆H₃₂N₄Cu(ClO₄)₂ apabila masing-masing bertindak balas dengan kuprum(II) asetat monohidrat dalam larutan asetonitril dan akues. Walaubagaimanapun, apabila tindak balas yang sama dilakukan dalam cecair ionik 1-butil-3-metilimidazolium heksaflorofosfat, [Bmim][PF₆], keperkadaran tidak seimbang berlaku dan menghasilkan kompleks kuprum(II) bis(etilenadiamina) bis(perklorato-O), C₄H₁₆N₄Cu(ClO₄)₂. Kajian X-ray menunjukkan atom kuprum berkoordinasi dengan dua ligan etilenadiamina dan dua atom oksigen ion perklorat dalam keadaan oktahedron terherot. Analisis termogravimetri (TGA) menunjukkan kompleks terurai dengan mengalami kehilangan jisim mendadak pada 260 ℃ disebabkan oleh sifat perklorat yang mudah meletup.

 

Kata kunci:  cecair ionik, keperkadaran tidak seimbang, kompleks kuprum(II)

 

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