Designer magnets containing cyanides and nitriles.
Magnets synthesized from molecules have contributed to the renaissance in the study of magnetic materials. Three-dimensional network solids exhibiting magnetic ordering have been made from several first-row metal ions and bridging unsaturated cyanide, tricyanomethanide, and/or dicyanamide ligands. These materials possess several different structural motifs, and the shorter the bridge, the stronger the interaction (i.e., {sup {single_bond}}C{sub {triple_bond}}N{sup {single_bond}} > {sup {single_bond}}N{sub {triple_bond}}C{sup {single_bond}}{sup {single_bond}}N{sup {single_bond}} >> N{sub {triple_bond}}C{sup {single_bond}}N{sup {single_bond}}C{sub {triple_bond}}N{sup {single_bond}} = N{sub {triple_bond}}C{sup {single_bond}}C{sup {single_bond}}C{sub {triple_bond}}N{sup {single_bond}}). Cyanide additionally has the ability to discriminate between C- and N-bonding to form ordered heterobimetallic magnets, and the strong coupling can lead to ferro- or ferrimagnetic ordering substantially above room temperature. Tricoordination of tricyanomethanide results in spin-frustrated systems, which possess interpenetrating rutile-like networks. In contrast, single rutile-like frameworks are formed by {mu}{sub 3}-bonded dicyanamide, which leads to ferromagnetics and weak ferromagnetics.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 943148
- Report Number(s):
- ANL/MSD/JA-37837; ACHRE4; TRN: US201002%%559
- Journal Information:
- Acc. Chem. Res., Vol. 34, Issue 7 ; Jul. 2001; ISSN 0001-4842
- Country of Publication:
- United States
- Language:
- ENGLISH
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