Mononuclear and heterometallic dinuclear, trinuclear and dimer-of-dinuclear complexes derived from single- and double-compartment Schiff base ligands having a less utilized diamine

Metal(II) Complexes of Compartmental Polynuclear Schiff Bases Containing Phenolate and Alkoxy Groups

“…Many of such Schiff base complexes have been isolated with 3d, 4f and alkali metal ions [7,10,17,18,[20][21][22][23][24][30][31][32][40][41][42][56][57][58][59][60]. Mononuclear complexes with O 2 -O 2 bonding site mode are very rare but they have been observed in a few cases with H 2 L OR -en Schiff bases with K + [61] and especially with Ln(NO 3 ) 3 (Ln = Ho, Sm, Nd) when the imino groups are protonated [62,63].…”

“…The brownish yellow crystalline [Ni(L OEt -ambza)] (5) complex, the analog of 4, was obtained from the reaction of the ligand with Ni(NO 3 ) 2 .6H 2 O (1:1 molar ratio) in slightly basic ethanolic solution (Et 3 N, pH~9). In the 1-5 compounds, Cu(II) or Ni(II) ions are bound to the N 2 -O 2 coordination sites (see X-ray section) and many similar mononuclear [6,[20][21][22]32] [3][4][5][6][7][14][15][16]19,[25][26][27][28][29][32][33][34][35][36][37][38][39]41,42]. The rigidity associated with the Schiff bases derived from 1,2-diaminobenzene (H 2 L OR -phda) and 2-aminobenzylamine (H 2 L OEt -ambza) make the two phenolate rings not coplanar with the central benzene ring and as a result the two alkoxy groups are pointing away.…”

“…Among many of these compounds which are widely used are those emerged through the Schiff base condensation reactions of diamines (ethylenediamine, en; propylenediamine, tn; 2,2-dimethylpropylenediamine, dmtn; o-phenylenediamine, phda and o-aminobenzylamine, ambza) with 2-hydroxy-3-alkoxybenzaldehyde (Scheme 1) in ethanol or methanol [1][2][3][4][5][6][7][8][9][10][11][12][13]. This is most likely attributed to not only to their ease of preparation but also to the bridging capability of the deionized phenolic group (pK a = [8][9][10][11][12] to bind two metal ions in close proximity [1][2][3][4][5][6][14][15][16][17].…”

Dimeric, Two‐Dimensional and Metal‐Centered Rectangular Heterometallic CuII–AgI/CdII/BaII Systems Derived from a Single Compartmental Ligand

“…Undoubtedly, we can say that the following types of single‐compartmental and double‐compartmental ligands are among the most studied ligand systems to derive varieties of metal complexes: (i) 2:1 condensation products of salicylaldehyde or 2‐hydroxyacetophenone or 2‐hydroxypropiophenone and a diamine for single‐compartmental ligands;‐ (ii) 2:1 condensation products of 3‐methoxysalicylaldehyde or 3‐ethoxysalicylaldehyde and a diamine for double‐compartmental ligands ,, The diamine used to derive in these ligands include ethylenediamine, 1‐methylethylenediamine, 1,1‐dimethylethylenediamine, 1,2‐diaminocyclohexane, o ‐phenylenediamine, 1,3‐diaminopropane, 2,2‐dimethyl‐1,3‐diaminopropane, 1,4‐diaminobutane.…”

Syntheses, structures and catecholase activity of two cobalt(III) complexes derived from N,N′-ethylenebis(3-ethoxysalicylaldiimine): A special host–guest system from a special ligand

“…Many mono/di/oligonuclear metal complexes have been reported from the following types of acyclic Schiff base ligands: (i) Single-compartment ligands (H 2 L Single ), obtained on [2+1] condensation of salicylaldehyde/2-hydroxyacetophenone/2-hydroxypropiophenone and a diamine [1][2][3][4][5][6][7][8][9][10][11]; Double-compartment ligands H 2 L OMe [1,[12][13][14][15][16][17][18] and H 2 L OEt [1,[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] ligands, obtained on [2+1] condensation of 3-methoxysalicylaldehyde and 3-ethoxysalicylaldehyde, respectively, and a diamine. It has been established that H 2 L OEt ligands are something special because its O(phenoxo) 2 O(ethoxy) 2 compartment is strongly potential to act as a hydrogen bond acceptor with hydrogen bond donors such as water [1,[19][20][21][22][23][24][25]…”