A cyano-bridged single-molecule magnet:: Slow magnetic relaxation in a trigonal prismatic MnMO6(CN)18 cluster

被引：364

作者：

Sokol, JJ ^{[1
]}

Hee, AG ^{[1
]}

Long, JR ^{[1
]}

机构：

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

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2002年 / 124卷 / 26期

关键词：

D O I：

10.1021/ja0263846

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report the synthesis of the first well-documented example of a cyano-bridged single-molecule magnet. An assembly reaction parallel to that employed in producing the trigonal prismatic [(Me3tacn)6MnCr6(CN)18]2+ (Me3tacn = N,N-,N-trimethyl-1,4,7-triazacyclononane) cluster affords K[(Me3tacn)6MnMo6(CN)18](ClO4)3 (1), containing an analogous molybdenum(III)-substituted cluster. Fits to the DC magnetic susceptibility and magnetization data for 1 show that the MnMo6 cluster possesses weak antiferromagnetic coupling (J = -6.7 cm-1), leading to an S = 13/2 ground state with significantly enhanced magnetic anisotropy (D = -0.33 cm-1 and E = -0.018 cm-1). Consistent with these results, AC magnetic susceptibility measurements show the molecule to exhibit slow magnetic relaxation indicative of a single-molecule magnet with an energy barrier of 10 cm-1 for spin reversal. Copyright © 2002 American Chemical Society.

引用

页码：7656 / 7657

页数：2

共 28 条

[1] MONONUCLEAR IRON(II), MANGANESE(II), AND NICKEL(II) AND TETRANUCLEAR IRON(III) COMPLEXES OF A NEW HEXADENTATE LIGAND [J].

ARULSAMY, N ;

GLERUP, J ;

HODGSON, DJ .

INORGANIC CHEMISTRY, 1994, 33 (14) :3043-3050

[2] Distorted MnIVMn3III cubane complexes as single-molecule magnets [J].

Aubin, SMJ ;

Wemple, MW ;

Adams, DM ;

Tsai, HL ;

Christou, G ;

Hendrickson, DN .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1996, 118 (33) :7746-7754

[3] Superparamagnetic-like behavior in an octanuclear iron cluster [J].

Barra, AL ;

Debrunner, P ;

Gatteschi, D ;

Schulz, CE ;

Sessoli, R .

EUROPHYSICS LETTERS, 1996, 35 (02) :133-138

[4] SYNTHESIS AND CRYSTAL-STRUCTURE OF [MNII(H3L)(L)MNIV][PF6]3 [H3L = N,N',N''-TRIS-(2S)-2-HYDROXYPROPYL-1,4,7-TRIAZACYCLONONANE] - A MIXED-VALENCE PENDANT-ARM MACROCYCLE DIMER IN WHICH THE LIGAND ADOPTS DIFFERENT ANGULAR GEOMETRIES AT THE 2 METAL CENTERS [J].

BELAL, AA ;

FALLIS, I ;

FARRUGIA, LJ ;

MACDONALD, NM ;

PEACOCK, RD .

JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS, 1991, (06) :402-403

[5] High-nuclearity metal-cyanide clusters:: Assembly of a Cr8Ni6(CN)24 cage with a face-centered cubic geometry [J].

Berseth, PA ;

Sokol, JJ ;

Shores, MP ;

Heinrich, JL ;

Long, JR .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2000, 122 (40) :9655-9662

[6] Single-molecule magnets:: A new family of Mn12 clusters of formula [Mn12O8X4(O2CPh)8L6] [J].

Boskovic, C ;

Brechin, EK ;

Streib, WE ;

Folting, K ;

Bollinger, JC ;

Hendrickson, DN ;

Christou, G .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2002, 124 (14) :3725-3736

[7] Single-molecule magnets:: Tetranuclear vanadium(III) complexes with a butterfly structure and an S=3 ground state [J].

Castro, SL ;

Sun, ZM ;

Grant, CM ;

Bollinger, JC ;

Hendrickson, DN ;

Christou, G .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1998, 120 (10) :2365-2375

[8]

Dunbar KR, 1997, PROG INORG CHEM, V45, P283

[9] HIGH-TEMPERATURE MOLECULAR MAGNETS BASED ON CYANOVANADATE BUILDING-BLOCKS - SPONTANEOUS MAGNETIZATION AT 230-K [J].

ENTLEY, WR ;

GIROLAMI, GS .

SCIENCE, 1995, 268 (5209) :397-400

[10] Towards nanostructured arrays of single molecule magnets: : new Fe19 oxyhydroxide clusters displaying high ground state spins and hysteresis [J].

Goodwin, JC ;

Sessoli, R ;

Gatteschi, D ;

Wernsdorfer, W ;

Powell, AK ;

Heath, SL .

JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, 2000, (12) :1835-1840

← 1 2 3 →