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Single-Atom O-Bridged Urea in a Dinickel(II) Complex together with NiII4, CuII2 and CuII4 Complexes of a Pentadentate Phenol-Containing Schiff Base with (O,N,O,N,O)-Donor Atoms

✍ Scribed by Soumen Mukherjee; Thomas Weyhermüller; Eberhard Bothe; Karl Wieghardt; Phalguni Chaudhuri

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
251 KB
Volume
2003
Category
Article
ISSN
1434-1948

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✦ Synopsis

Abstract

A pentadentate phenol‐containing ligand (H~3~L) with N~2~O~3~ donor atoms yields Ni^II^~2~ (1), Ni^II^~4~ (2), Cu^II^~2~ (3) and Cu^II^~4~ (4) complexes, which have been structurally characterized by X‐ray diffraction. Complex 1 contains a single‐atom O‐bridged urea. The compounds were characterized by IR, UV/Vis, mass spectrometry, electrochemistry and variable‐temperature (2−295 K) magnetic susceptibility measurements. Analysis of the susceptibility data shows antiferromagnetic interactions between the metal centers indicating a diamagnetic ground state for complexes 1, 3 and 4, whereas complex 2, a tetranuclear Ni^II^ cubane, has a complicated low‐lying magnetic structure with a non‐diamagnetic ground state. A plot of J vs. Ni−O−Ni angles for all structurally characterized Ni~4~O~4~ cubane cores, including 2, irrespective of their symmetry exhibits a large variation of J values within a small range of Ni−O−Ni angles. The electrochemistry of all complexes was investigated in detail and the ligand‐centered oxidation to a radical‐ligand is inferred from the occurrence of oxidation processes at potentials which are similar. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)

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✍ Soumen Mukherjee; Thomas Weyhermüller; Eberhard Bothe; Phalguni Chaudhuri 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 214 KB

## Abstract Dinuclear complexes [L~2~Fe^III^~2~] (1), [L~2~Mn^III^~2~] (2a), [L~2~Mn^III^~2~(THF)~2~] (2b), [L~2~Cr^III^~2~] (3), [L(V^IV^O)~2~(OCHMe~2~)] (4) and [L~2~(V^V^O)~2~] (5) with a pentadentate phenol‐containing ligand H~3~L (= C~6~H~2~(CH~3~)(OH){[C(CH~3~)~3~]~2~(OH)NCH}~2~) bearing the