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Synthesis and structural characterization of centrosymmetric multinuclear nickel(II) complexes with neutral tetradentate N6-ligand

A neutral tetradentate ligand L1 L1 = 3,6-bis(pyrazol-1-yl)-pyridazine] reacts with Ni(ClO4)(2)center dot 6H(2)O and undergoes counterion exchange with PF6- to give di- and tetranuclear complexes Ni-2(L1)(2)(CH3CN)(4)](PF6)(4)center dot 4H(2)O (1) and Ni-4(L1)(4)(mu-OH)(4)](ClO4)(4)center dot 2H(2)O...

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Main Authors: Subramaniam, Jeevithra Dewi, Lee, Sze Koon, Chinapang, Pondchanok, Praneeth, Vijayendran K. K., Okamura, Masaya, Kondo, Mio, Masaoka, Shigeyuki, Woi, Pei Meng
Format: Article
Published: Springer 2021
Subjects:
QD Chemistry
TP Chemical technology
Online Access:http://eprints.um.edu.my/34122/
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spelling my.um.eprints.341222022-06-22T07:34:42Z http://eprints.um.edu.my/34122/ Synthesis and structural characterization of centrosymmetric multinuclear nickel(II) complexes with neutral tetradentate N6-ligand Subramaniam, Jeevithra Dewi Lee, Sze Koon Chinapang, Pondchanok Praneeth, Vijayendran K. K. Okamura, Masaya Kondo, Mio Masaoka, Shigeyuki Woi, Pei Meng QD Chemistry TP Chemical technology A neutral tetradentate ligand L1 L1 = 3,6-bis(pyrazol-1-yl)-pyridazine] reacts with Ni(ClO4)(2)center dot 6H(2)O and undergoes counterion exchange with PF6- to give di- and tetranuclear complexes Ni-2(L1)(2)(CH3CN)(4)](PF6)(4)center dot 4H(2)O (1) and Ni-4(L1)(4)(mu-OH)(4)](ClO4)(4)center dot 2H(2)O (2), respectively. The presence of 1,8-diazabicyclo5.4.0]undec-7-ene (DBU) as base controls the nuclearity of the complex formation. Both complexes were structurally characterized by physicochemical and spectroscopic techniques. Their crystal structures revealed that both complexes are centrosymmetric and adopt slightly distorted octahedral geometry. Complex 1 crystallizes in monoclinic space group C2/c as the Ni(II) center is octahedrally bound to L1 in a trans-isomer arrangement. Complex 2 crystallizes in tetragonal space group I4(1)/amd with four L1 and four hydroxy bridging ligands linked to Ni(II) center in cis-isomer arrangement. Cyclic voltammograms of complexes 1 and 2 were measured under Ar and CO2. Under CO2, the quasireversible peaks of both complexes become irreversible and a current enhancement occurs under reduction. Springer 2021-03 Article PeerReviewed Subramaniam, Jeevithra Dewi and Lee, Sze Koon and Chinapang, Pondchanok and Praneeth, Vijayendran K. K. and Okamura, Masaya and Kondo, Mio and Masaoka, Shigeyuki and Woi, Pei Meng (2021) Synthesis and structural characterization of centrosymmetric multinuclear nickel(II) complexes with neutral tetradentate N6-ligand. Transition Metal Chemistry, 46 (3). pp. 255-262. ISSN 0340-4285, DOI https://doi.org/10.1007/s11243-020-00441-5 <https://doi.org/10.1007/s11243-020-00441-5>. 10.1007/s11243-020-00441-5
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic QD Chemistry
TP Chemical technology
spellingShingle QD Chemistry
TP Chemical technology
Subramaniam, Jeevithra Dewi
Lee, Sze Koon
Chinapang, Pondchanok
Praneeth, Vijayendran K. K.
Okamura, Masaya
Kondo, Mio
Masaoka, Shigeyuki
Woi, Pei Meng
Synthesis and structural characterization of centrosymmetric multinuclear nickel(II) complexes with neutral tetradentate N6-ligand
description A neutral tetradentate ligand L1 L1 = 3,6-bis(pyrazol-1-yl)-pyridazine] reacts with Ni(ClO4)(2)center dot 6H(2)O and undergoes counterion exchange with PF6- to give di- and tetranuclear complexes Ni-2(L1)(2)(CH3CN)(4)](PF6)(4)center dot 4H(2)O (1) and Ni-4(L1)(4)(mu-OH)(4)](ClO4)(4)center dot 2H(2)O (2), respectively. The presence of 1,8-diazabicyclo5.4.0]undec-7-ene (DBU) as base controls the nuclearity of the complex formation. Both complexes were structurally characterized by physicochemical and spectroscopic techniques. Their crystal structures revealed that both complexes are centrosymmetric and adopt slightly distorted octahedral geometry. Complex 1 crystallizes in monoclinic space group C2/c as the Ni(II) center is octahedrally bound to L1 in a trans-isomer arrangement. Complex 2 crystallizes in tetragonal space group I4(1)/amd with four L1 and four hydroxy bridging ligands linked to Ni(II) center in cis-isomer arrangement. Cyclic voltammograms of complexes 1 and 2 were measured under Ar and CO2. Under CO2, the quasireversible peaks of both complexes become irreversible and a current enhancement occurs under reduction.
format Article
author Subramaniam, Jeevithra Dewi
Lee, Sze Koon
Chinapang, Pondchanok
Praneeth, Vijayendran K. K.
Okamura, Masaya
Kondo, Mio
Masaoka, Shigeyuki
Woi, Pei Meng
author_facet Subramaniam, Jeevithra Dewi
Lee, Sze Koon
Chinapang, Pondchanok
Praneeth, Vijayendran K. K.
Okamura, Masaya
Kondo, Mio
Masaoka, Shigeyuki
Woi, Pei Meng
author_sort Subramaniam, Jeevithra Dewi
title Synthesis and structural characterization of centrosymmetric multinuclear nickel(II) complexes with neutral tetradentate N6-ligand
title_short Synthesis and structural characterization of centrosymmetric multinuclear nickel(II) complexes with neutral tetradentate N6-ligand
title_full Synthesis and structural characterization of centrosymmetric multinuclear nickel(II) complexes with neutral tetradentate N6-ligand
title_fullStr Synthesis and structural characterization of centrosymmetric multinuclear nickel(II) complexes with neutral tetradentate N6-ligand
title_full_unstemmed Synthesis and structural characterization of centrosymmetric multinuclear nickel(II) complexes with neutral tetradentate N6-ligand
title_sort synthesis and structural characterization of centrosymmetric multinuclear nickel(ii) complexes with neutral tetradentate n6-ligand
publisher Springer
publishDate 2021
url http://eprints.um.edu.my/34122/
_version_ 1738510710145548288
score 13.211869

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