Enantiopure Mono‐ and Mixed‐Valence Multinuclear Cobalt Complexes from Amino Alcohol Based Ligands

Abstract

Chiral amino alcohol based tridentate Schiff bases, derived from 5-OMe-, 5-H-, and 5-NO 2 -substituted salicylaldehydes and (S)-(+)-2-phenylglycinol and (S)-(-)-2-amino-3-phenyl-1-propanol, were found to act as versatile ligands in their coordination behavior towards cobalt and gave a range of complexes like mononuclear low-spin Co III

Defective dicubanes of CoII/CoIII complexes with triethanolamine and N-donors

“…Therefore, the properties of the employed ligands in each ternary system are found to control the nuclearity but also the overall geometry of the resulting tetranuclear clusters with distinct coordination modes. 35 The IR spectra of 1-3 exhibit characteristic vibrations of the CvN of the N-donor groups detected at 1607 cm −1 for 1, 1610 cm −1 for 2 and 1625 cm −1 for 3 which correspond to the coordinated stretching frequencies of pyr, bpy and phen, respectively. Triethanolamine molecules have been assigned at three regions: (a) medium bands at 3400 cm −1 for 2 and 3 are assigned to the stretching vibrations of OH groups; (b) at about 2960 cm −1 and around 2930 cm −1 the ν as (C-H) and ν sym (C-H) are detected in 1-3, respectively; and (c) three bands in the region of 1050 cm −1 are attributed to the ν(C-Ο) stretching in 1-3.…”

Propeller‐Shaped Fe4 and Fe3M Molecular Nanomagnets: A Journey from Crystals to Addressable Single Molecules

“…Of primary interest for this Microreview are iron(III)‐based Fe 4 complexes, which feature a central metal ion surrounded by three peripheral metal centers arranged at the vertices of a triangle. This metal‐ion topology is not uncommon in coordination chemistry, being found in Werner's brown salt, in its chromium(III) analogue and in a variety of other homo‐ or heteroleptic, homo‐ or heteronuclear species . Considering the arrangement of the metal ions and of the bridging donor atoms, the structure often directly resembles that of a propeller with either idealized or strict D 3 symmetry and is thus chiral.…”

Two 2D metal–organic frameworks based on N-heterocyclic and polycarboxylates ligands: Syntheses, structures, and photoluminescent properties

“…Single-crystal X-ray structural analysis reveals that the asymmetric unit of complex 1 contains one Mn(II) atoms, one dipt ligand, three BDC ligands and one lattice water molecule. The Mn(II) atom shows a hexa-coordinated arrangement, which arises from four carboxylic oxygen atoms [Mn-O carboxylic = 2.098 (3) [13][14][15][16].…”