A mononuclear MnN4O2 complex with two zwitterionic li- gands and a centrosymmetric tetranuclear µ3-OH-bridged self-assembled Mn4 cluster were synthesized and charac- terized by using the [NO(H)N] ligand HOPhbip [2,6-bis(phen- ylmethyliminomethyl)-4-methylphenol]. The reaction in MeOH in the presence of NH4SCN and a lower stoichiometry of Mn(OAc)2·4H2O without any added base produces [MnII (HNbip)2(NCS)2]·CH3CN (1·CH3CN). In the presence of NaOH and NH4SCN in MeOH, the cluster [MnII 4(µ-bip)2(µ3-OH)2(NCS)4](2), featuring a stepped-cubane, was obtained through hydroxido-bridge-driven dimerization of two µ3-OH-bridged [Mn2] fragments derived from 1·CH3CN.
Reaction Medium pH Dependent Existence of MnII Bound [ON] Donor Zwitterionic Chelating Ligand and Self-Assembly of Hydroxido-Bridged MnII4 Cluster
BERTOLASI, Valerio;
2010
Abstract
A mononuclear MnN4O2 complex with two zwitterionic li- gands and a centrosymmetric tetranuclear µ3-OH-bridged self-assembled Mn4 cluster were synthesized and charac- terized by using the [NO(H)N] ligand HOPhbip [2,6-bis(phen- ylmethyliminomethyl)-4-methylphenol]. The reaction in MeOH in the presence of NH4SCN and a lower stoichiometry of Mn(OAc)2·4H2O without any added base produces [MnII (HNbip)2(NCS)2]·CH3CN (1·CH3CN). In the presence of NaOH and NH4SCN in MeOH, the cluster [MnII 4(µ-bip)2(µ3-OH)2(NCS)4](2), featuring a stepped-cubane, was obtained through hydroxido-bridge-driven dimerization of two µ3-OH-bridged [Mn2] fragments derived from 1·CH3CN.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
