Slow Magnetic Relaxation in CoIICuII Coordination Oligomer Built into Mesoporous Material
✍ Scribed by Danielle Cangussu; Wallace C. Nunes; Cynthia L. M. Pereira; Emerson F. Pedroso; Italo O. Mazali; Marcelo Knobel; Oswaldo L. Alves; Humberto O. Stumpf
- Book ID
- 102827683
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 594 KB
- Volume
- 2008
- Category
- Article
- ISSN
- 1434-1948
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
The ferrimagnetic system CoCu(opba) [opba = ortho‐phenylenebis(oxamato)] was employed to prepare a traditional chain [CoCu(opba)]**·**4H~2~O (1) and a nanocomposite by incorporation in porous Vycor glass (PVG). This nanocomposite was made by first anchoring [Bu~4~N]~2~[Cu(opba)] on PVG [PVG‐Cu (2)] and then treating it “in situ__”__ with cobalt(II) acetate to obtain the nanomagnet PVG‐CuCo (3). Magnetic measurements show that 1 consists of a one‐dimensional ferrimagnet with strong intrachain antiferromagnetic coupling and weak interchain interactions that result in spin‐glass behavior below 3.5 K. Nanocomposite 3 presents ferrimagnetic chains limited by the nanopore size, which leads to a slow relaxation of the magnetization following Arrhenius' law, frequency dependence for in‐phase and out‐of‐phase susceptibility, and hysteresis below the blocked regime temperature (< 6 K). These features are characteristics of single‐chain magnets (SCM).(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)