TY - JOUR
T1 - Strong electron-accepting methylviologen dication confined in magnetic hosts
T2 - Synthesis, structural characterization, charge-transfer and magnetic properties of ((MV)2[Ni(SCN)5]·Cl·2H2O)n and ((MV)[M(N3)2(SCN)2])n (M = Mn, Co)
AU - Ju, Zhan Feng
AU - Yao, Qing Xia
AU - Wu, Wei
AU - Zhang, Jie
PY - 2007/12/10
Y1 - 2007/12/10
N2 - Three hybrid host–guest compounds ((MV)2[Ni(SCN)5]·Cl·2H2O)n (1), ((MV)[Mn(N3)2(SCN)2])n (2) and ((MV)[Co(N3)2(SCN)2])n (3) (where MV2+ = methylviologen dication) have been obtained by self-assembly methods and characterized by X-ray crystallography, spectral methods and magnetic measurements. Compound 1 shows a quasi-two-dimensional structure which is formed by novel single thiocyanate-bridged Ni(ii) chains connected through S⋯S interactions. Compounds 2 and 3 are isostructural, containing single µ1,3-azide bridged Mn(ii)/Co(ii) square layers. MV2+, as a strong electron-acceptor and a template, is embedded between the anionic layers in all three compounds. The charge-transfer (CT) interactions between MV2+ and the anionic hosts have been revealed by structural analysis and UV-vis diffuse reflection spectroscopy. The magnetic studies of the compounds show antiferromagnetic interactions between adjacent metal ions (J = –34.52(7) cm–1 for 1, J = –3.90(2) cm–1 for 2 and J = –10.96(6) cm–1 for 3).
AB - Three hybrid host–guest compounds ((MV)2[Ni(SCN)5]·Cl·2H2O)n (1), ((MV)[Mn(N3)2(SCN)2])n (2) and ((MV)[Co(N3)2(SCN)2])n (3) (where MV2+ = methylviologen dication) have been obtained by self-assembly methods and characterized by X-ray crystallography, spectral methods and magnetic measurements. Compound 1 shows a quasi-two-dimensional structure which is formed by novel single thiocyanate-bridged Ni(ii) chains connected through S⋯S interactions. Compounds 2 and 3 are isostructural, containing single µ1,3-azide bridged Mn(ii)/Co(ii) square layers. MV2+, as a strong electron-acceptor and a template, is embedded between the anionic layers in all three compounds. The charge-transfer (CT) interactions between MV2+ and the anionic hosts have been revealed by structural analysis and UV-vis diffuse reflection spectroscopy. The magnetic studies of the compounds show antiferromagnetic interactions between adjacent metal ions (J = –34.52(7) cm–1 for 1, J = –3.90(2) cm–1 for 2 and J = –10.96(6) cm–1 for 3).
UR - http://www.scopus.com/inward/record.url?scp=85034351604&partnerID=8YFLogxK
U2 - 10.1039/b710628a
DO - 10.1039/b710628a
M3 - Article
AN - SCOPUS:37849024391
SN - 1470-479X
SP - 355
EP - 362
JO - Journal of the Chemical Society. Dalton Transactions
JF - Journal of the Chemical Society. Dalton Transactions
IS - 3
ER -