Structure, aggregation and spectroscopic properties of self-assembled Zn(II) Schiff base complexes

Nawal K. Al Rasbi, Harry Adams, Ibtisam Alshabibi, Fatma Alamri

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The structures and photophysical properties of Zn(II) complexes with the tridentate Schiff base ligand HL: 1-((E)-((pyridin-2-yl)methylimino)methyl) naphthalen-2-ol, have been synthesized and fully characterized. The X-ray structures of the complexes showed unusual and inequivalent dimeric assemblies of Zn(II) that were tuned by the counter ions used. The complex [ZnL(HL)] 2(ClO4)2, 1, proves the self-assembly of a box-like structure that stabilized by OH⋯OR contacts within the complex. The complex [Zn2(μ-L)2(NO3)2], 2, contains two symmetrical Zn(II) centers that are directly linked by two oxo bridges from two ligands. The 1H NMR spectra in non-polar solvents such as CDCl3 confirmed the stability of the dimeric assemblies and aggregation in solution. By controlling the counter ions used, e.g. ClO 4 or NO3 and the polarity of solution, the Zn(II) complexes would form molecular aggregates at different extents with different emission properties in the solid and solution states. The solid-state emission spectra exhibited a spectral red-shift on the ligand-based emission besides a growth of a low-energy feature in 1 due to face-to-face π⋯π contacts between the aromatic rings in the box-like assembly. Therefore, complex 1 emits greenish-blue light and complex 2 emits blue light.

Original languageEnglish
Pages (from-to)37-43
Number of pages7
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume285
DOIs
Publication statusPublished - Jul 1 2014

Fingerprint

Schiff Bases
imines
Radiation counters
Agglomeration
Ligands
assemblies
ligands
boxes
counters
solid state
red shift
Self assembly
self assembly
polarity
ions
emission spectra
solid solutions
assembly
Nuclear magnetic resonance
X rays

Keywords

  • Aggregation
  • Crystal structure
  • Emission
  • Zinc

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

Cite this

Structure, aggregation and spectroscopic properties of self-assembled Zn(II) Schiff base complexes. / Al Rasbi, Nawal K.; Adams, Harry; Alshabibi, Ibtisam; Alamri, Fatma.

In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 285, 01.07.2014, p. 37-43.

Research output: Contribution to journalArticle

@article{0645ef114dde4fdcb1bb671cfe28ed8e,
title = "Structure, aggregation and spectroscopic properties of self-assembled Zn(II) Schiff base complexes",
abstract = "The structures and photophysical properties of Zn(II) complexes with the tridentate Schiff base ligand HL: 1-((E)-((pyridin-2-yl)methylimino)methyl) naphthalen-2-ol, have been synthesized and fully characterized. The X-ray structures of the complexes showed unusual and inequivalent dimeric assemblies of Zn(II) that were tuned by the counter ions used. The complex [ZnL(HL)] 2(ClO4)2, 1, proves the self-assembly of a box-like structure that stabilized by OH⋯OR contacts within the complex. The complex [Zn2(μ-L)2(NO3)2], 2, contains two symmetrical Zn(II) centers that are directly linked by two oxo bridges from two ligands. The 1H NMR spectra in non-polar solvents such as CDCl3 confirmed the stability of the dimeric assemblies and aggregation in solution. By controlling the counter ions used, e.g. ClO 4 or NO3 and the polarity of solution, the Zn(II) complexes would form molecular aggregates at different extents with different emission properties in the solid and solution states. The solid-state emission spectra exhibited a spectral red-shift on the ligand-based emission besides a growth of a low-energy feature in 1 due to face-to-face π⋯π contacts between the aromatic rings in the box-like assembly. Therefore, complex 1 emits greenish-blue light and complex 2 emits blue light.",
keywords = "Aggregation, Crystal structure, Emission, Zinc",
author = "{Al Rasbi}, {Nawal K.} and Harry Adams and Ibtisam Alshabibi and Fatma Alamri",
year = "2014",
month = "7",
day = "1",
doi = "10.1016/j.jphotochem.2014.03.020",
language = "English",
volume = "285",
pages = "37--43",
journal = "Journal of Photochemistry and Photobiology A: Chemistry",
issn = "1010-6030",
publisher = "Elsevier",

}

TY - JOUR

T1 - Structure, aggregation and spectroscopic properties of self-assembled Zn(II) Schiff base complexes

AU - Al Rasbi, Nawal K.

AU - Adams, Harry

AU - Alshabibi, Ibtisam

AU - Alamri, Fatma

PY - 2014/7/1

Y1 - 2014/7/1

N2 - The structures and photophysical properties of Zn(II) complexes with the tridentate Schiff base ligand HL: 1-((E)-((pyridin-2-yl)methylimino)methyl) naphthalen-2-ol, have been synthesized and fully characterized. The X-ray structures of the complexes showed unusual and inequivalent dimeric assemblies of Zn(II) that were tuned by the counter ions used. The complex [ZnL(HL)] 2(ClO4)2, 1, proves the self-assembly of a box-like structure that stabilized by OH⋯OR contacts within the complex. The complex [Zn2(μ-L)2(NO3)2], 2, contains two symmetrical Zn(II) centers that are directly linked by two oxo bridges from two ligands. The 1H NMR spectra in non-polar solvents such as CDCl3 confirmed the stability of the dimeric assemblies and aggregation in solution. By controlling the counter ions used, e.g. ClO 4 or NO3 and the polarity of solution, the Zn(II) complexes would form molecular aggregates at different extents with different emission properties in the solid and solution states. The solid-state emission spectra exhibited a spectral red-shift on the ligand-based emission besides a growth of a low-energy feature in 1 due to face-to-face π⋯π contacts between the aromatic rings in the box-like assembly. Therefore, complex 1 emits greenish-blue light and complex 2 emits blue light.

AB - The structures and photophysical properties of Zn(II) complexes with the tridentate Schiff base ligand HL: 1-((E)-((pyridin-2-yl)methylimino)methyl) naphthalen-2-ol, have been synthesized and fully characterized. The X-ray structures of the complexes showed unusual and inequivalent dimeric assemblies of Zn(II) that were tuned by the counter ions used. The complex [ZnL(HL)] 2(ClO4)2, 1, proves the self-assembly of a box-like structure that stabilized by OH⋯OR contacts within the complex. The complex [Zn2(μ-L)2(NO3)2], 2, contains two symmetrical Zn(II) centers that are directly linked by two oxo bridges from two ligands. The 1H NMR spectra in non-polar solvents such as CDCl3 confirmed the stability of the dimeric assemblies and aggregation in solution. By controlling the counter ions used, e.g. ClO 4 or NO3 and the polarity of solution, the Zn(II) complexes would form molecular aggregates at different extents with different emission properties in the solid and solution states. The solid-state emission spectra exhibited a spectral red-shift on the ligand-based emission besides a growth of a low-energy feature in 1 due to face-to-face π⋯π contacts between the aromatic rings in the box-like assembly. Therefore, complex 1 emits greenish-blue light and complex 2 emits blue light.

KW - Aggregation

KW - Crystal structure

KW - Emission

KW - Zinc

UR - http://www.scopus.com/inward/record.url?scp=84899819645&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84899819645&partnerID=8YFLogxK

U2 - 10.1016/j.jphotochem.2014.03.020

DO - 10.1016/j.jphotochem.2014.03.020

M3 - Article

VL - 285

SP - 37

EP - 43

JO - Journal of Photochemistry and Photobiology A: Chemistry

JF - Journal of Photochemistry and Photobiology A: Chemistry

SN - 1010-6030

ER -