pH-Dependent structural diversity of a 2-pyridinemethanol Cu complex and its relatively strong magnetic exchange coupling via hydrogen bonding

Tomohiko Hamaguchi; Tomoko Nagata; Shinya Hayami; Satoshi Kawata; Isao Ando

doi:10.1039/C7DT00718C

pH-Dependent structural diversity of a 2-pyridinemethanol Cu complex and its relatively strong magnetic exchange coupling via hydrogen bonding†

Tomohiko Hamaguchi,

*^a Tomoko Nagata,^a Shinya Hayami,

^bc Satoshi Kawata

^a and Isao Ando^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan
E-mail: thama@fukuoka-u.ac.jp

^b Department of Chemistry, Graduate School of Science and Technology (GSST), Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto 860-8555, Japan

^c Institute of Pulsed Power Science (IPPS), Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto 860-8555, Japan

Abstract

The diversity of the self-assembled structures of a Cu complex via hydrogen bonding, including a square planar unit, is reported. The Cu complex forms two self-assembled structures by hydrogen bonding, depending on the acidity of the recrystallization conditions. A linear chain structure can be produced under acidic conditions, and a three-dimensional network structure is observed under basic conditions. The linear chain structure is constructed from intermolecular sharing of a hydrogen atom between two 2-pyridinemethanolate units, with an O⋯O distance of 2.412(1) Å and an O–H–O bond angle of 170(3)°. The linear chain structure exhibits relatively strong magnetic coupling (J = −9.91(2) cm⁻¹) via hydrogen bonding between Cu atoms; this coupling was also confirmed by electron spin resonance experiments. Thermochromic behavior was also observed for the complex.

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DOI: https://doi.org/10.1039/C7DT00718C
Article type: Paper
Submitted: 27 Feb 2017
Accepted: 28 Mar 2017
First published: 28 Mar 2017

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Dalton Trans., 2017,46, 6196-6201

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pH-Dependent structural diversity of a 2-pyridinemethanol Cu complex and its relatively strong magnetic exchange coupling via hydrogen bonding

T. Hamaguchi, T. Nagata, S. Hayami, S. Kawata and I. Ando, Dalton Trans., 2017, 46, 6196 DOI: 10.1039/C7DT00718C

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pH-Dependent structural diversity of a 2-pyridinemethanol Cu complex and its relatively strong magnetic exchange coupling via hydrogen bonding†

Abstract

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pH-Dependent structural diversity of a 2-pyridinemethanol Cu complex and its relatively strong magnetic exchange coupling via hydrogen bonding

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