Two tetranuclear 3d–4f heterometal complexes Mn₂Ln₂ (Ln = Dy, Gd): synthesis, structure, magnetism, and electrocatalytic reactivity for water oxidation

Abstract

The two Mn2Ln2 complexes can catalyze water oxidation, which may arise from the cooperative catalytic effect of the Mn/Ln ions.

A tetranuclear CuII2DyIII2 coordination cluster as a Suzuki (C–C) coupling reaction promoter

“…3 In this direction, 3d/4f in situ [4][5][6] or well characterised coordination clusters have recently emerged as sustainable catalytic platforms with advantages in their ease synthesis, good abundance (in spite of belonging to the so-called rare earths) and low cost. 7 Our group has established the efficacy of a series of tetranuclear [M II 2Ln III 2L4(X)2(solv)2] (M = Ni, Co, Cu, Zn, X = Cl, NO3, Ln = Y, Dy, Gd) for domino-electro cyclization and Lewis acid reactions, [8][9][10][11] whereas other groups have, successfully, used them in redox, [12][13][14] co-polymerization 15 and carbon dioxide fixation reactions. 16,17 The metal-promoted Suzuki-Miyaura coupling includes organoboron derivatives and carbon electrophiles, and represents a valuable procedure for a C-C bond formation (Scheme 1).…”

A new co-crystal dinuclear/trinuclear ZnII–ZnII/ZnII–SmIII–ZnII complex with a salen-type Schiff base ligand

“…Over recent years, polyheteronuclear complexes of 3d and 4f metals have been studied with increasing interest by chemists (Cristó vã o et al, 2017;Cristó vã o & Miroslaw, 2013;Ding et al, 2015;Tian et al, 2012;Wu & Hou, 2010). The various structures obtained (Rossi et al, 2018;Zhou et al, 2015;Ghosh & Ghosh, 2016), the physicochemical properties (Cristó vã o et al, 2017) and the potential applications in fields such as luminescence (Zhao et al, 2014;Zhu et al, 2018), magneto chemistry (Chesman et al, 2012;Klokishner & Reu, 2012), electrochemistry (Yin et al, 2017) and catalysis (Lan et al, 2018) have made this chemistry very attractive. These compounds are obtained from Schiff bases, which are organic compounds having several donor sites, which are used to assemble stable structures with transition metal or lanthanide ISSN 2056-9890 ions.…”

Water Oxidation by a Neoteric Dinuclear Mn(II) Electrocatalyst in Aqueous Medium

“…[35] Next, Lan and co-workers designed MnÀ Ln based tetranuclear complex that was able to drive water oxidation events electrochemically in phosphate buffer at an applied overpotential of 880 mV vs. NHE. [36] A family of surface-anchored Mn complexes [Mn II (H 2 O) 2 (X) 2 (dcbpy)] (where dcbpy = 4,4'-dicarboxy-2,2'-bipyridine and X=CH 3 COO À , SO 4 2À , Cl À ) over gold electrode was investigated to be active towards oxidation process at neutral pH. [37] On carrying out catalysis, CH towards electrocatalytic water oxidation in aqueous medium at pH 6 with an extraordinarily lesser overpotential of 334 mV and 74 mV respectively.…”