| Title | Observation of Magnetic Bistability in Polymorphs of the [Ni(dmit)(2)](-) Complexes |
| Authors | Zang, Shuangquan Ren, Xiaoming Su, Yang Song, You Tong, Wenjun Ni, Zhaoping Zhao, Hanhua Gao, Song Meng, Qingjin |
| Affiliation | Nanjing Univ, Dept Chem, State Key Lab Coordinat Chem, Nanjing 210093, Peoples R China. Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA. Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing 100871, Peoples R China. |
| Keywords | TRANSITION-METAL-COMPLEXES SUPRAMOLECULAR CATION STRUCTURE STRUCTURAL PHASE-TRANSITION EXCHANGE COUPLING-CONSTANTS NICKEL DITHIOLENE COMPLEX DIMENSIONAL SPIN SYSTEM MOLECULAR CONDUCTORS CRYSTAL-STRUCTURE OPTICAL BISTABILITY CROSSOVER |
| Issue Date | 2009 |
| Publisher | inorganic chemistry |
| Citation | INORGANIC CHEMISTRY.2009,48,(20),9623-9630. |
| Abstract | Four ion-pair complexes of [Ni(dmit)(2)](-) with [NO(2)bzql](+) have been obtained, which belong to two kinds of polymorph forms, [NO(2)bzql][Ni(dmit)(2)] (1 alpha and 1 beta) and [NO(2)bzql][Ni(dmit)(2)]center dot CH3COCH3 (2 alpha and 2 beta) (where dmit = 2-thioxo-1,3-dithiole-4,5-dithiolate and [NO(2)bzql](+) = 1-(4-nitrobenzyl)quinolinium). Though 1 alpha, 2 alpha, and 2 beta all show anionic dimerization structures at room temperature, they have different anionic and cationic arrangement fashions, which give rise to different magnetic behaviors for these polymorphs or pseudo-polymorphs. Compounds 1 alpha, 1 beta, and 2 alpha exhibit magnetic bistabilities. In particular, 1 alpha has a hysteretic loop at similar to 55 K, while 2 beta does not display a spin transition in the 2-300 K range. On the basis of the crystal structure data of 2 alpha in high-and low-temperature phases, the magnetic coupling feature within the [Ni(dmit)(2)](-) spin dimer was explored with the broken-symmetry approach at the UBPW91/LANL2DZ level; combined with the experimental data and theoretical analyses, the relationship between the magnetic coupling nature and the stacking pattern of [Ni(dmit)(2)](-) anions as well as the origin of the phase interconversion are discussed. |
| URI | http://hdl.handle.net/20.500.11897/246045 |
| ISSN | 0020-1669 |
| DOI | 10.1021/ic900090e |
| Indexed | SCI(E) |
| Appears in Collections: | å å¦ä¸ å å å·¥ç¨ å¦é ¢ 稀土材料化学与应用国家重点实验室 |
