scholarly journals Tuning coordination modes of pyridine/thioether Schiff base (NNS) ligands to mononuclear manganese carbonyls

2014 ◽  
Vol 43 (28) ◽  
pp. 10725-10738 ◽  
Author(s):  
Simone E. A. Lumsden ◽  
Gummadi Durgaprasad ◽  
Keren A. Thomas Muthiah ◽  
Michael J. Rose
Keyword(s):  
Schiff Base ◽  
Coordination Modes ◽  
Manganese Carbonyls

Manganese carbonyls are ligated by pyridine/thioether Schiff base (NNS) ligands. Coordination of the thioether-S donor to the Mn(i) center is determined by subtle steric changes at the ligand periphery.

Biological activity and coordination modes of copper(ii) complexes of Schiff base-derived coumarin ligands

2010 ◽  
Vol 39 (45) ◽  
pp. 10854 ◽  
Author(s):  
Bernadette Sarah Creaven ◽  
Eszter Czeglédi ◽  
Michael Devereux ◽  
Éva Anna Enyedy ◽  
Agnieszka Foltyn-Arfa Kia ◽  
...  
Keyword(s):  
Biological Activity ◽  
Schiff Base ◽  
Coordination Modes

Different coordination modes of trans-2-{[(2-methoxyphenyl)imino]methyl}phenoxide in rare-earth complexes: influence of the metal cation radius and the number of ligands on steric congestion and ligand coordination modes

2018 ◽  
Vol 74 (10) ◽  
pp. 1105-1115 ◽  
Author(s):  
Dmitrii M. Roitershtein ◽  
Kseniya I. Minashina ◽  
Mikhail E. Minyaev ◽  
Ivan V. Ananyev ◽  
Konstantin A. Lyssenko ◽  
...  
Keyword(s):  
Schiff Base ◽  
Rare Earth ◽  
Catalytic Performance ◽  
Absolute Methanol ◽  
Exchange Reactions ◽  
Ionic Radii ◽  
Catalytic Systems ◽  
Coordination Modes ◽  
Molar Ratios ◽  
Cation Radius

A simple and effective synthetic route to homo- and heteroleptic rare-earth (Ln = Y, La and Nd) complexes with a tridentate Schiff base anion has been demonstrated using exchange reactions of rare-earth chlorides with in-situ-generated sodium (E)-2-{[(2-methoxyphenyl)imino]methyl}phenoxide in different molar ratios in absolute methanol. Five crystal structures have been determined and studied, namely tris(2-{[(2-methoxyphenyl)imino]methyl}phenolato-κ3 O 1,N,O 2)lanthanum, [La(C14H12NO2)3], (1), tris(2-{[(2-methoxyphenyl)imino]methyl}phenolato-κ3 O 1,N,O 2)neodymium tetrahydrofuran disolvate, [La(C14H12NO2)3]·2C4H8O, (2)·2THF, tris(2-{[(2-methoxyphenyl)imino]methyl}phenolato)-κ3 O 1,N,O 2;κ3 O 1,N,O 2;κ2 N,O 1-yttrium, [Y(C14H12NO2)3], (3), dichlorido-1κCl,2κCl-μ-methanolato-1:2κ2 O:O-methanol-2κO-(μ-2-{[(2-methoxyphenyl)imino]methyl}phenolato-1κ3 O 1,N,O 2:2κO 1)bis(2-{[(2-methoxyphenyl)imino]methyl}phenolato)-1κ3 O 1,N,O 2;2κ3 O 1,N,O 2-diyttrium–tetrahydrofuran–methanol (1/1/1), [Y2(C14H12NO2)3(CH3O)Cl2(CH4O)]·CH4O·C4H8O, (4)·MeOH·THF, and bis(μ-2-{[(2-methoxyphenyl)imino]methyl}phenolato-1κ3 O 1,N,O 2:2κO 1)bis(2-{[(2-methoxyphenyl)imino]methyl}phenolato-2κ3 O 1,N,O 2)sodiumyttrium chloroform disolvate, [NaY(C14H12NO2)4]·2CHCl3, (5)·2CHCl3. Structural peculiarities of homoleptic tris(iminophenoxide)s (1)–(3), binuclear tris(iminophenoxide) (4) and homoleptic ate tetrakis(iminophenoxide) (5) are discussed. The nonflat Schiff base ligand displays μ2-κ3 O 1,N,O 2:κO 1 bridging, and κ3 O 1,N,O 2 and κ2 N,O 1 terminal coordination modes, depending on steric congestion, which in turn depends on the ionic radii of the rare-earth metals and the number of coordinated ligands. It has been demonstrated that interligand dihedral angles of the phenoxide ligand are convenient for comparing steric hindrance in complexes. (4)·MeOH has a flat Y2O2 rhomboid core and exhibits both inter- and intramolecular MeO—H...Cl hydrogen bonding. Catalytic systems based on complexes (1)–(3) and (5) have demonstrated medium catalytic performance in acrylonitrile polymerization, providing polyacrylonitrile samples with narrow polydispersity.

A flexible multidentate Schiff-base ligand having multifarious coordination modes in its copper(II) and cadmium(II) complexes

Polyhedron ◽  
2014 ◽  
Vol 67 ◽  
pp. 314-320 ◽  
Author(s):  
Hui-Fen Qian ◽  
Yuan Dai ◽  
Jiao Geng ◽  
Li Wang ◽  
Cheng Wang ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Coordination Modes

Spin-crossover in an iron(iii) complex showing a broad thermal hysteresis

2021 ◽  
Author(s):  
Cyril Rajnák ◽  
Romana Mičová ◽  
Ján Moncoľ ◽  
Ľubor Dlháň ◽  
Christoph Krüger ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Mononuclear Complex ◽  
Hysteresis Width ◽  
Thermally Induced

A pentadentate Schiff-base ligand 3,5Cl-L2− and NCSe− form a iron(iii) mononuclear complex [Fe(3,5Cl-L)(NCSe)], which shows a thermally induced spin crossover with a broad hysteresis width of 24 K between 123 K (warming) and 99 K (cooling).

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