Steric-Hindrance Effect of a Substituent in the Self-Assembly Process of Copper(II) Complexes with Quadridentate Schiff-Base Ligands Involving a 2-Substituted-Imidazole Moiety

Naohide Matsumoto, Masaaki Mimura, Yukinari Sunatsuki, Shingo Eguchi, Yukiko Mizuguchi, Hitoshi Miyasaka, Toshio Nakashima

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Four copper(II) complexes with unsymmetrical quadridentate ligands involving an imidazole moiety, [CuHL n]-ClO 4 (1 - 4; n=1 - 4), have been prepared and characterized, where HL 1 = N-salicylidene-N'-(2-methylimidazol-4-ylmethylidene)-1,3-propanediamine, HL 2 =N-salicylidene-N'-(2-phenylimidazol-4-ylmethylidene)-1,3-propanediamine, HL 3 = N-acetylacetonylidene-N'-(2-methylimidazol-4-ylmethylidene)ethylenediamine, HL 4 = N-acetylacetonylidene-N'-(2-phenylimidazol-4-ylmethylidene)ethylenediamine, respectively. The corresponding deprotonated complexes 1′-4′ were obtained when 1 - 4 were treated under an alkaline condition. Deprotonation of the imidazole moiety of the copper-(II) complex motivates a self-assembly process which is formed by an axial coordination of the imidazolate nitrogen atom of a molecular unit to the copper(II) ion of another unit. 1′-3′ assumes a self-assembled imidazolate-bridged infinite-chain structure {Cu(II)-Im} n in the solid state, while the polymeric species dissociates to monomeric species in the solution state. 4′ consists of a discrete deprotonated monomeric species, even in the solid state. The physical measurements, including reflectance and absorption spectra, cryomagnetic measurements, and single-crystal X-ray analyses, revealed that the self-assembly behavior for the series of copper(II) complexes depends both on the steric effect of the substituent of 2-substituted-4-formylimidazole moiety and the ligand field strength of the equatorial quadridentate ligand.

Original languageEnglish
Pages (from-to)2461-2472
Number of pages12
JournalBulletin of the Chemical Society of Japan
Volume70
Issue number10
Publication statusPublished - Oct 1997
Externally publishedYes

Fingerprint

ethylenediamine
Schiff Bases
Self assembly
Copper
Ligands
Deprotonation
Reflectometers
Absorption spectra
Nitrogen
Single crystals
Ions
X rays
Atoms
imidazole
trimethylenediamine
2-phenylimidazole
2-methylimidazole

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Steric-Hindrance Effect of a Substituent in the Self-Assembly Process of Copper(II) Complexes with Quadridentate Schiff-Base Ligands Involving a 2-Substituted-Imidazole Moiety. / Matsumoto, Naohide; Mimura, Masaaki; Sunatsuki, Yukinari; Eguchi, Shingo; Mizuguchi, Yukiko; Miyasaka, Hitoshi; Nakashima, Toshio.

In: Bulletin of the Chemical Society of Japan, Vol. 70, No. 10, 10.1997, p. 2461-2472.

Research output: Contribution to journalArticle

Matsumoto, Naohide ; Mimura, Masaaki ; Sunatsuki, Yukinari ; Eguchi, Shingo ; Mizuguchi, Yukiko ; Miyasaka, Hitoshi ; Nakashima, Toshio. / Steric-Hindrance Effect of a Substituent in the Self-Assembly Process of Copper(II) Complexes with Quadridentate Schiff-Base Ligands Involving a 2-Substituted-Imidazole Moiety. In: Bulletin of the Chemical Society of Japan. 1997 ; Vol. 70, No. 10. pp. 2461-2472.
@article{0bec955ef3a8488ca685745d673f9e7a,
title = "Steric-Hindrance Effect of a Substituent in the Self-Assembly Process of Copper(II) Complexes with Quadridentate Schiff-Base Ligands Involving a 2-Substituted-Imidazole Moiety",
abstract = "Four copper(II) complexes with unsymmetrical quadridentate ligands involving an imidazole moiety, [CuHL n]-ClO 4 (1 - 4; n=1 - 4), have been prepared and characterized, where HL 1 = N-salicylidene-N'-(2-methylimidazol-4-ylmethylidene)-1,3-propanediamine, HL 2 =N-salicylidene-N'-(2-phenylimidazol-4-ylmethylidene)-1,3-propanediamine, HL 3 = N-acetylacetonylidene-N'-(2-methylimidazol-4-ylmethylidene)ethylenediamine, HL 4 = N-acetylacetonylidene-N'-(2-phenylimidazol-4-ylmethylidene)ethylenediamine, respectively. The corresponding deprotonated complexes 1′-4′ were obtained when 1 - 4 were treated under an alkaline condition. Deprotonation of the imidazole moiety of the copper-(II) complex motivates a self-assembly process which is formed by an axial coordination of the imidazolate nitrogen atom of a molecular unit to the copper(II) ion of another unit. 1′-3′ assumes a self-assembled imidazolate-bridged infinite-chain structure {Cu(II)-Im} n in the solid state, while the polymeric species dissociates to monomeric species in the solution state. 4′ consists of a discrete deprotonated monomeric species, even in the solid state. The physical measurements, including reflectance and absorption spectra, cryomagnetic measurements, and single-crystal X-ray analyses, revealed that the self-assembly behavior for the series of copper(II) complexes depends both on the steric effect of the substituent of 2-substituted-4-formylimidazole moiety and the ligand field strength of the equatorial quadridentate ligand.",
author = "Naohide Matsumoto and Masaaki Mimura and Yukinari Sunatsuki and Shingo Eguchi and Yukiko Mizuguchi and Hitoshi Miyasaka and Toshio Nakashima",
year = "1997",
month = "10",
language = "English",
volume = "70",
pages = "2461--2472",
journal = "Bulletin of the Chemical Society of Japan",
issn = "0009-2673",
publisher = "Chemical Society of Japan",
number = "10",

}

TY - JOUR

T1 - Steric-Hindrance Effect of a Substituent in the Self-Assembly Process of Copper(II) Complexes with Quadridentate Schiff-Base Ligands Involving a 2-Substituted-Imidazole Moiety

AU - Matsumoto, Naohide

AU - Mimura, Masaaki

AU - Sunatsuki, Yukinari

AU - Eguchi, Shingo

AU - Mizuguchi, Yukiko

AU - Miyasaka, Hitoshi

AU - Nakashima, Toshio

PY - 1997/10

Y1 - 1997/10

N2 - Four copper(II) complexes with unsymmetrical quadridentate ligands involving an imidazole moiety, [CuHL n]-ClO 4 (1 - 4; n=1 - 4), have been prepared and characterized, where HL 1 = N-salicylidene-N'-(2-methylimidazol-4-ylmethylidene)-1,3-propanediamine, HL 2 =N-salicylidene-N'-(2-phenylimidazol-4-ylmethylidene)-1,3-propanediamine, HL 3 = N-acetylacetonylidene-N'-(2-methylimidazol-4-ylmethylidene)ethylenediamine, HL 4 = N-acetylacetonylidene-N'-(2-phenylimidazol-4-ylmethylidene)ethylenediamine, respectively. The corresponding deprotonated complexes 1′-4′ were obtained when 1 - 4 were treated under an alkaline condition. Deprotonation of the imidazole moiety of the copper-(II) complex motivates a self-assembly process which is formed by an axial coordination of the imidazolate nitrogen atom of a molecular unit to the copper(II) ion of another unit. 1′-3′ assumes a self-assembled imidazolate-bridged infinite-chain structure {Cu(II)-Im} n in the solid state, while the polymeric species dissociates to monomeric species in the solution state. 4′ consists of a discrete deprotonated monomeric species, even in the solid state. The physical measurements, including reflectance and absorption spectra, cryomagnetic measurements, and single-crystal X-ray analyses, revealed that the self-assembly behavior for the series of copper(II) complexes depends both on the steric effect of the substituent of 2-substituted-4-formylimidazole moiety and the ligand field strength of the equatorial quadridentate ligand.

AB - Four copper(II) complexes with unsymmetrical quadridentate ligands involving an imidazole moiety, [CuHL n]-ClO 4 (1 - 4; n=1 - 4), have been prepared and characterized, where HL 1 = N-salicylidene-N'-(2-methylimidazol-4-ylmethylidene)-1,3-propanediamine, HL 2 =N-salicylidene-N'-(2-phenylimidazol-4-ylmethylidene)-1,3-propanediamine, HL 3 = N-acetylacetonylidene-N'-(2-methylimidazol-4-ylmethylidene)ethylenediamine, HL 4 = N-acetylacetonylidene-N'-(2-phenylimidazol-4-ylmethylidene)ethylenediamine, respectively. The corresponding deprotonated complexes 1′-4′ were obtained when 1 - 4 were treated under an alkaline condition. Deprotonation of the imidazole moiety of the copper-(II) complex motivates a self-assembly process which is formed by an axial coordination of the imidazolate nitrogen atom of a molecular unit to the copper(II) ion of another unit. 1′-3′ assumes a self-assembled imidazolate-bridged infinite-chain structure {Cu(II)-Im} n in the solid state, while the polymeric species dissociates to monomeric species in the solution state. 4′ consists of a discrete deprotonated monomeric species, even in the solid state. The physical measurements, including reflectance and absorption spectra, cryomagnetic measurements, and single-crystal X-ray analyses, revealed that the self-assembly behavior for the series of copper(II) complexes depends both on the steric effect of the substituent of 2-substituted-4-formylimidazole moiety and the ligand field strength of the equatorial quadridentate ligand.

UR - http://www.scopus.com/inward/record.url?scp=0001586278&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001586278&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0001586278

VL - 70

SP - 2461

EP - 2472

JO - Bulletin of the Chemical Society of Japan

JF - Bulletin of the Chemical Society of Japan

SN - 0009-2673

IS - 10

ER -