Observation of a Secondary Slow Relaxation Process for the Field-Induced Single-Molecule Magnet U(H2BPz2)3

被引：233

作者：

Rinehart, Jeffrey D. ^{[1
]}

Meihaus, Katie R. ^{[1
]}

Long, Jeffrey R. ^{[1
]}

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2010年 / 132卷 / 22期

关键词：

COMPLEXES;

D O I：

10.1021/ja1009019

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The trigonal prismatic complex U(H(2)BPz(2))(3) is characterized by single crystal X-ray diffraction and ac magnetic susceptibility measurements. The ac susceptibility data demonstrate the presence of multiple processes responsible for slow magnetic relaxation. Out-of-phase signals observed at ac switching frequencies between 1 and 1500 Hz in dc fields of 500-5000 Oe indicate a thermal relaxation barrier of ca. 8 cm(-1) for the molecule, with a temperature-independent process taking over at the lowest temperatures probed. Significantly, an unprecedented, slower relaxation process becomes apparent for ac switching frequencies between 0.06 and 1 Hz, for which a monotonic increase of the relaxation time with an applied dc field suggests a direct relaxation pathway.

引用

页码：7572 / +

页数：3

共 19 条

[1]

Abragam A., 1970, ELECT PARAMAGNETIC R

[2]

AIDamen M.A., 2009, INORG CHEM, V48, P3467

[3] Mononuclear lanthanide single-molecule magnets based on polyoxometalates [J].

AlDamen, Murad A. ;

Clemente-Juan, Juan M. ;

Coronado, Eugenio ;

Marti-Gastaldo, Carlos ;

Gaita-Arino, Alejandro .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2008, 130 (28) :8874-+

[4] Slow Magnetic Relaxation in a High-Spin Iron(II) Complex [J].

Freedman, Danna E. ;

Harman, W. Hill ;

Harris, T. David ;

Long, Gary J. ;

Chang, Christopher J. ;

Long, Jeffrey R. .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2010, 132 (04) :1224-+

[5] Thermally activated resonant magnetization tunneling in molecular magnets: Mn12Ac and others [J].

Garanin, DA ;

Chudnovsky, EM .

PHYSICAL REVIEW B, 1997, 56 (17) :11102-11118

[6]

Gatteschi D, 2006, MESOSCOPIC PHYS NANO, P1

[7] Lanthanide double-decker complexes functioning as magnets at the single-molecular level [J].

Ishikawa, N ;

Sugita, M ;

Ishikawa, T ;

Koshihara, S ;

Kaizu, Y .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2003, 125 (29) :8694-8695

[8] Mononuclear lanthanide complexes with a long magnetization relaxation time at high temperatures: A new category of magnets at the single-molecular level [J].

Ishikawa, N ;

Sugita, M ;

Ishikawa, T ;

Koshihara, S ;

Kaizu, Y .

JOURNAL OF PHYSICAL CHEMISTRY B, 2004, 108 (31) :11265-11271

[9] Effects of Chemically Induced Contraction of a Coordination Polyhedron on the Dynamical Magnetism of Bis(phthalocyaninato)disprosium, a Single-4f-Ionic Single-Molecule Magnet with a Kramers Ground State [J].

Ishikawa, Naoto ;

Mizuno, Yoshifumi ;

Takamatsu, Satoshi ;

Ishikawa, Tadahiko ;

Koshihara, Shin-ya .

INORGANIC CHEMISTRY, 2008, 47 (22) :10217-10219

[10] BIS(CYCLOOCTATETRAENYL)NEPTUNIUM(IV) AND BIS(CYCLOOCTATETRAENYL)PLUTONIUM(IV) [J].

KARRAKER, DG ;

STONE, JA ;

JONES, ER ;

EDELSTEIN, N .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1970, 92 (16) :4841-+

← 1 2 →