Hsiu-Rong Chang

Modelling the photosynthetic water oxidation centre: synthesis, structure, and magnetic properties of [Mn4O2(OAc)7(biphy)2ClO4]·3H2O (bipy = 2,2′-bipyridine)

The synthesis, structure, and magnetic properties of [Mn4O2(OAc)7(bipy)2](ClO4)·3H2O, bipy = 2,2′-bipyridine) are reported; this complex is the first tetranuclear oxide-bridged manganese(III) species and represents the best available model for the photosynthetic water oxidation centre.

Mixed valence manganese-(II, III) and -(III, IV) dinuclear complexes: preparation, structure, magnetochemistry, and e.s.r. spectra of Mn2(biphen)2(biphenH)(bpy)2 and Mn2O2Cl2(OAc)(bpy)2(biphenH2= 2,2′-biphenol, bpy = 2,2′-bipyridine)

The preparation and properties of two new mixed valence Mn complexes, Mn2(biphen)2(biphenH)(bpy)2(3) and Mn2O2Cl2(OAc)(bpy)2(2)(bpy = 2,2′-bipyridine, biphenH2= 2,2′-biphenol) are reported; complex (3) has a rare S= 9/2 ground state confirmed by magnetization studies.

Support from model studies for the proposed existence of an S–1 oxidation level in the manganese assembly of the photosynthetic water oxidation centre

The preparation and properties of the oxide-bridged tetranuclear complex [Mn4O2(OAc)6(bpy)2](1)(bpy = 2,2′-bipyridine) are reported; the complex has an average metal oxidation state of +2.5, corresponding to the putative S–1 oxidation state of the photosynthetic water oxidation centre.

Synthesis and structure of (PPh4)2Na[Cr3(SCH2CH2O)6] containing a linear chromium(III) trimer with terminal thiolate and bridging alkoxide linkages

(PPh4)2Na[Cr3(SCH2CH2O)6]·2EtOH has been obtained from the reaction of CrCl3(THF)3(THF = tetrahydrofuran) with HSCH2CH2OH–2NaOEt in EtOH; the anion is the first example of a linear chromium(III) trimer and contains antiferromagnetically-coupled metal centres with an S= 3/2 ground state.