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Reaction Medium pH Dependent Existence of Mn II Bound [ON] Donor Zwitterionic Chelating Ligand and Self‐Assembly of Hydroxido‐Bridged Mn II 4 Cluster
Author(s) -
Sarkar Mrinal,
Bertolasi Valerio,
Ray Debashis
Publication year - 2010
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201000170
Subject(s) - chemistry , ligand (biochemistry) , cubane , cluster (spacecraft) , manganese , stoichiometry , crystallography , chelation , stereochemistry , medicinal chemistry , crystal structure , inorganic chemistry , organic chemistry , receptor , biochemistry , computer science , programming language
A mononuclear MnN 4 O 2 complex with two zwitterionic ligands and a centrosymmetric tetranuclear μ 3 ‐OH‐bridged self‐assembled Mn 4 cluster were synthesized and characterized by using the [NO(H)N] ligand H OPh bip [2,6‐bis(phenylmethyliminomethyl)‐4‐methylphenol]. The reaction in MeOH in the presence of NH 4 SCN and a lower stoichiometry of Mn(OAc) 2 · 4H 2 O without any added base produces [Mn II (H N bip) 2 (NCS) 2 ] · CH 3 CN ( 1· CH 3 CN). In the presence of NaOH and NH 4 SCN in MeOH, the cluster [Mn II 4 (μ‐bip) 2 (μ 3 ‐OH) 2 (NCS) 4 ] ( 2 ), featuring a stepped‐cubane, was obtained through hydroxido‐bridge‐driven dimerization of two μ 3 ‐OH‐bridged [Mn 2 ] fragments derived from 1· CH 3 CN.