Self-assembled macrocyclic molecular squares of Ni(II) derived from carbohydrazones and thiocarbohydrazones: Structural and magnetic studies

E. Manoj; M. R. Prathapachandra Kurup; H. K. Fun; Alex Punnoose

doi:10.1016/j.poly.2007.05.048

Self-assembled macrocyclic molecular squares of Ni(II) derived from carbohydrazones and thiocarbohydrazones: Structural and magnetic studies

E. Manoj
, M. R. Prathapachandra Kurup
, H. K. Fun
, Alex Punnoose

Physics Department

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

Four novel molecular square grids were achieved by self-assembly using the flexible ligands bis(di-2-pyridyl ketone) thiocarbohydrazone (H₂L¹), bis(quinoline-2-carbaldehyde) thiocarbohydrazone (H₂L²), bis(di-2-pyridyl ketone) carbohydrazone (H₂L³) and bis(2-benzoylpyridine) carbohydrazone (H₂L⁴). Three complexes were given a general formula of [Ni(HL)]₄[PF₆]₄ · nH₂O and one [Ni₂(HL²)L²]₂(PF₆)₂ · 7H₂O. The MALDI-MS spectra reveal the formation of tetranuclear molecular squares. The square grid of the Ni(II) centers in all the complexes were organized by deprotonated ligands. The complex [Ni(HL¹)]₄[PF₆]₄ · 11H₂O crystallized as [Ni(HL¹)]₄(PF₆)₄ · 0.5 CH₃CH₂OH · 2.8H₂O and X-ray study revealed octahedral geometries around the Ni(II) centers. Variable temperature magnetic studies suggest intramolecular antiferromagnetic coupling between the Ni(II) electrons by a super exchange mechanism through intervening sulfur/oxygen atoms.

Original language	English
Pages (from-to)	4451-4462
Number of pages	12
Journal	Polyhedron
Volume	26
Issue number	15
DOIs	https://doi.org/10.1016/j.poly.2007.05.048
State	Published - 20 Sep 2007

Keywords

Carbohydrazone
Magnetism
MALDI
Molecular square
Nickel(II) complex
Self-assembly
Thiocarbohydrazone

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10.1016/j.poly.2007.05.048

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title = "Self-assembled macrocyclic molecular squares of Ni(II) derived from carbohydrazones and thiocarbohydrazones: Structural and magnetic studies",

abstract = "Four novel molecular square grids were achieved by self-assembly using the flexible ligands bis(di-2-pyridyl ketone) thiocarbohydrazone (H2L1), bis(quinoline-2-carbaldehyde) thiocarbohydrazone (H2L2), bis(di-2-pyridyl ketone) carbohydrazone (H2L3) and bis(2-benzoylpyridine) carbohydrazone (H2L4). Three complexes were given a general formula of [Ni(HL)]4[PF6]4 · nH2O and one [Ni2(HL2)L2]2(PF6)2 · 7H2O. The MALDI-MS spectra reveal the formation of tetranuclear molecular squares. The square grid of the Ni(II) centers in all the complexes were organized by deprotonated ligands. The complex [Ni(HL1)]4[PF6]4 · 11H2O crystallized as [Ni(HL1)]4(PF6)4 · 0.5 CH3CH2OH · 2.8H2O and X-ray study revealed octahedral geometries around the Ni(II) centers. Variable temperature magnetic studies suggest intramolecular antiferromagnetic coupling between the Ni(II) electrons by a super exchange mechanism through intervening sulfur/oxygen atoms.",

keywords = "Carbohydrazone, Magnetism, MALDI, Molecular square, Nickel(II) complex, Self-assembly, Thiocarbohydrazone",

author = "E. Manoj and \{Prathapachandra Kurup\}, \{M. R.\} and Fun, \{H. K.\} and Alex Punnoose",

year = "2007",

month = sep,

day = "20",

doi = "10.1016/j.poly.2007.05.048",

language = "English",

volume = "26",

pages = "4451--4462",

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TY - JOUR

T1 - Self-assembled macrocyclic molecular squares of Ni(II) derived from carbohydrazones and thiocarbohydrazones

T2 - Structural and magnetic studies

AU - Manoj, E.

AU - Prathapachandra Kurup, M. R.

AU - Fun, H. K.

AU - Punnoose, Alex

PY - 2007/9/20

Y1 - 2007/9/20

N2 - Four novel molecular square grids were achieved by self-assembly using the flexible ligands bis(di-2-pyridyl ketone) thiocarbohydrazone (H2L1), bis(quinoline-2-carbaldehyde) thiocarbohydrazone (H2L2), bis(di-2-pyridyl ketone) carbohydrazone (H2L3) and bis(2-benzoylpyridine) carbohydrazone (H2L4). Three complexes were given a general formula of [Ni(HL)]4[PF6]4 · nH2O and one [Ni2(HL2)L2]2(PF6)2 · 7H2O. The MALDI-MS spectra reveal the formation of tetranuclear molecular squares. The square grid of the Ni(II) centers in all the complexes were organized by deprotonated ligands. The complex [Ni(HL1)]4[PF6]4 · 11H2O crystallized as [Ni(HL1)]4(PF6)4 · 0.5 CH3CH2OH · 2.8H2O and X-ray study revealed octahedral geometries around the Ni(II) centers. Variable temperature magnetic studies suggest intramolecular antiferromagnetic coupling between the Ni(II) electrons by a super exchange mechanism through intervening sulfur/oxygen atoms.

AB - Four novel molecular square grids were achieved by self-assembly using the flexible ligands bis(di-2-pyridyl ketone) thiocarbohydrazone (H2L1), bis(quinoline-2-carbaldehyde) thiocarbohydrazone (H2L2), bis(di-2-pyridyl ketone) carbohydrazone (H2L3) and bis(2-benzoylpyridine) carbohydrazone (H2L4). Three complexes were given a general formula of [Ni(HL)]4[PF6]4 · nH2O and one [Ni2(HL2)L2]2(PF6)2 · 7H2O. The MALDI-MS spectra reveal the formation of tetranuclear molecular squares. The square grid of the Ni(II) centers in all the complexes were organized by deprotonated ligands. The complex [Ni(HL1)]4[PF6]4 · 11H2O crystallized as [Ni(HL1)]4(PF6)4 · 0.5 CH3CH2OH · 2.8H2O and X-ray study revealed octahedral geometries around the Ni(II) centers. Variable temperature magnetic studies suggest intramolecular antiferromagnetic coupling between the Ni(II) electrons by a super exchange mechanism through intervening sulfur/oxygen atoms.

KW - Carbohydrazone

KW - Magnetism

KW - MALDI

KW - Molecular square

KW - Nickel(II) complex

KW - Self-assembly

KW - Thiocarbohydrazone

UR - https://www.scopus.com/pages/publications/34548217722

U2 - 10.1016/j.poly.2007.05.048

DO - 10.1016/j.poly.2007.05.048

M3 - Article

AN - SCOPUS:34548217722

SN - 0277-5387

VL - 26

SP - 4451

EP - 4462

JO - Polyhedron

JF - Polyhedron

IS - 15

ER -

Self-assembled macrocyclic molecular squares of Ni(II) derived from carbohydrazones and thiocarbohydrazones: Structural and magnetic studies

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Keywords

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