E-resources
Peer reviewed
-
Clemente-Juan, Juan M; Coronado, Eugenio; Forment-Aliaga, Alicia; Gaita-Ariño, Alejandro; Giménez-Saiz, Carlos; Romero, Francisco M; Wernsdorfer, W; Biagi, R; Corradini, V
Inorganic chemistry, 01/2010, Volume: 49, Issue: 2Journal Article
The preparation, magnetic characterization, and X-ray structures of two polycationic Mn12 single-molecule magnets Mn12O12(bet)16(EtOH)4(PF6)14·4CH3CN·H2O (1) and Mn12O12(bet)16(EtOH)3(H2O)(PF6)13(OH)·6CH3CN·EtOH·H2O (2) (bet = betaine = (CH3)3N+−CH2−CO2 −) are reported. 1 crystallizes in the centrosymmetric P2/c space group and presents a (0:2:0:2) arrangement of the EtOH molecules in its structure. 2 crystallizes in the noncentrosymmetric P4̅ space group with two distinct Mn12 polycations, Mn12O12(bet)16(EtOH)2(H2O)214+ (2A) and Mn12O12(bet)16(EtOH)414+ (2B) per unit cell. 2A and 2B show a (1:1:1:1) distribution of the coordinated solvent molecules. Interestingly, bond valence sum calculations extracted from X-ray diffraction data indicate the presence of two Mn2+ ions in the Mn12 core for both 1 and 2. This finding is confirmed by X-ray absorption spectroscopy (XAS) measurements. A complete magnetic characterization, including subkelvin micro-SQUID magnetometry and inelastic neutron scattering (INS) measurements, permits to extract the parameters of the giant spin Hamiltonian of these polycations. Compared with the archetypal Mn12 acetate, an increase in the value of the ground spin state from S = 10 to S = 11 together with a decrease in the effective energy barrier, is observed for 1 and 2. Such a result is consistent with the reduction of two Mn3+ to the less anisotropic Mn2+ ion in the structures.
Shelf entry
Permalink
- URL:
Impact factor
Access to the JCR database is permitted only to users from Slovenia. Your current IP address is not on the list of IP addresses with access permission, and authentication with the relevant AAI accout is required.
Year | Impact factor | Edition | Category | Classification | ||||
---|---|---|---|---|---|---|---|---|
JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Select the library membership card:
If the library membership card is not in the list,
add a new one.
DRS, in which the journal is indexed
Database name | Field | Year |
---|
Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
---|
Source: Personal bibliographies
and: SICRIS
The material is available in full text. If you wish to order the material anyway, click the Continue button.