TY - JOUR
T1 - Supramolecular metallomacrocycles based on trans-dicyanoferrite(III) building blocks
T2 - Synthesis, crystal structure and magnetic properties
AU - Ni, Zhong Hai
AU - Tao, Jun
AU - Wernsdorfer, Wolfgang
AU - Cui, Ai Li
AU - Kou, Hui Zhong
PY - 2009
Y1 - 2009
N2 - The reaction of trans-[Fe(R-bpb)(CN)2]- (R-bpb 2- = R-substituted-1,2-bis(pyridine-2-carboxamido)benzenate) with trans-Mn(III) Schiff base complexes [Mn(5-X-saltn)]ClO4 (5-X-saltn2- = N,N′-propanolbis(5-X-substituted- salcylideneiminato) dianion) gave rise to cyanide-bridged neutral binuclear [MnFe] compounds [Mn(saltn)(MeOH)][Fe(bpb)(CN)2]·3H 2O (1), [Mn(saltn)(H2O)Fe(bpmb)(CN)2] ·H2O (2), [Mn(saltn)(MeOH)Fe(bpClb)(CN)2] ·2H2O (3), and ionic [Mn2Fe]+-[Fe] - complexes [Mn2(5-Br-saltn)2(H 2O)(EtOH)Fe(bpb)(CN)2][Fe(bpb)(CN)2] ·6H2O (4) and [Mn2(5-Cl-saltn)2(CH 3OH)(EtOH)Fe(bpb)(CN)2][Fe(bpb)(CN)2] ·5H2O·MeCN (5). Four binuclear units of complexes 1-3 assemble in a head-to-tail way via hydrogen bonding giving rise to a metallo-supramolecular [MnFe]4 square, while two [Mn 2Fe]+-[Fe]- units of complexes 4-5 form a metallo-supramolecular macrocyclic structure. Magnetic studies reveal that complexes 1-3 and 5 exhibit intermetallic ferromagnetic coupling, while complex 4 displays antiferromagnetic interaction between low-spin Fe(III) and high-spin Mn(III) through the cyanide bridges. Complexes 1, 4 and 5 display frequency dependent of current-alternating (ac) magnetic susceptibility, typical of the presence of slow magnetization relaxation. Because of the existence of intermolecular magnetic interaction, complex 4 shows an exchange-biased single-molecule magnet (SMM) behavior below 0.5 K.
AB - The reaction of trans-[Fe(R-bpb)(CN)2]- (R-bpb 2- = R-substituted-1,2-bis(pyridine-2-carboxamido)benzenate) with trans-Mn(III) Schiff base complexes [Mn(5-X-saltn)]ClO4 (5-X-saltn2- = N,N′-propanolbis(5-X-substituted- salcylideneiminato) dianion) gave rise to cyanide-bridged neutral binuclear [MnFe] compounds [Mn(saltn)(MeOH)][Fe(bpb)(CN)2]·3H 2O (1), [Mn(saltn)(H2O)Fe(bpmb)(CN)2] ·H2O (2), [Mn(saltn)(MeOH)Fe(bpClb)(CN)2] ·2H2O (3), and ionic [Mn2Fe]+-[Fe] - complexes [Mn2(5-Br-saltn)2(H 2O)(EtOH)Fe(bpb)(CN)2][Fe(bpb)(CN)2] ·6H2O (4) and [Mn2(5-Cl-saltn)2(CH 3OH)(EtOH)Fe(bpb)(CN)2][Fe(bpb)(CN)2] ·5H2O·MeCN (5). Four binuclear units of complexes 1-3 assemble in a head-to-tail way via hydrogen bonding giving rise to a metallo-supramolecular [MnFe]4 square, while two [Mn 2Fe]+-[Fe]- units of complexes 4-5 form a metallo-supramolecular macrocyclic structure. Magnetic studies reveal that complexes 1-3 and 5 exhibit intermetallic ferromagnetic coupling, while complex 4 displays antiferromagnetic interaction between low-spin Fe(III) and high-spin Mn(III) through the cyanide bridges. Complexes 1, 4 and 5 display frequency dependent of current-alternating (ac) magnetic susceptibility, typical of the presence of slow magnetization relaxation. Because of the existence of intermolecular magnetic interaction, complex 4 shows an exchange-biased single-molecule magnet (SMM) behavior below 0.5 K.
UR - http://www.scopus.com/inward/record.url?scp=63549106977&partnerID=8YFLogxK
U2 - 10.1039/b814860k
DO - 10.1039/b814860k
M3 - Article
AN - SCOPUS:63549106977
SN - 1477-9226
SP - 2788
EP - 2794
JO - Dalton Transactions
JF - Dalton Transactions
IS - 15
ER -