Bis(6-tert-butyliminomethyl)phenylamido complexes of divalent Mn, Fe, Co and Ni

(Alkyliminomethyl)phenylamido and related complexes of zirconium and titanium

“…We initiated a study in this area using the ligand backbones shown in Scheme 1. In the first of a series of papers we report on zirconium and titanium complexes with the N-silyl (R 1 = SiMe 3 , SiMe 2 Bu t ) substituted analogues of L. As previously noted, 5 L is related to a wide family of β-diketiminato ligands. 6…”

“…The o-[(tert-butyl)iminomethyl]aniline was synthesised by the literature method. 5 Following this method, condensation of Bu t NH 2 with the commercially available o-aminoacetophenone did not proceed even under forcing conditions and prolonged reaction times. However, reaction with cyclohexylamine in toluene in the presence of 4 Å molecular sieves afforded multigram quantities of the Schiff base in excellent yields.…”

“…3 The attractive features of these ligands are easy synthetic accessibility and steric and electronic tuning by substitution of the aromatic ring or the imine carbon. 3,4 In contrast, the coordination chemistry of the anionic ligands that formally originate from salicylaldiminato by replacement of the PhO Ϫ group with the isoelectronic PhNR Ϫ have received less attention, 5 even though the tuning opportunities in this case are even broader (Scheme 1).…”

(Alkyliminomethyl)phenylamido and related complexes of zirconium and titanium

“…We initiated a study in this area using the ligand backbones shown in Scheme 1. In the first of a series of papers we report on zirconium and titanium complexes with the N-silyl (R 1 = SiMe 3 , SiMe 2 Bu t ) substituted analogues of L. As previously noted, 5 L is related to a wide family of β-diketiminato ligands. 6…”

“…The o-[(tert-butyl)iminomethyl]aniline was synthesised by the literature method. 5 Following this method, condensation of Bu t NH 2 with the commercially available o-aminoacetophenone did not proceed even under forcing conditions and prolonged reaction times. However, reaction with cyclohexylamine in toluene in the presence of 4 Å molecular sieves afforded multigram quantities of the Schiff base in excellent yields.…”

“…3 The attractive features of these ligands are easy synthetic accessibility and steric and electronic tuning by substitution of the aromatic ring or the imine carbon. 3,4 In contrast, the coordination chemistry of the anionic ligands that formally originate from salicylaldiminato by replacement of the PhO Ϫ group with the isoelectronic PhNR Ϫ have received less attention, 5 even though the tuning opportunities in this case are even broader (Scheme 1).…”

Touching the upper limit for ferromagnetic interactions in hetero-bridged dinuclear [Cu 2 II ] complexes using a novel N 5 -dinucleating ligand bearing an endogenous monoatomic amido(R–NH − )-bridging group

“…Polynuclear metal complexes bearing either amido (R,R 0 -N À or R-NH À ) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] or hydrazido (R,R 0 -N-N 2À or R, R 0 -N-NH À ) 17,18 monoatomic bridging ligands are rather rare species, most of them being organometallic in nature, that have been prepared under anaerobic reaction conditions. Amongst amido-bridged polynuclear complexes containing paramagnetic metal ions [1][2][3][4][5][6][7][8][9][10][11][12][13] those that were magneto-structurally studied [5][6][7][8][11][12][13] invariably showed antiferromagnetic interactions between metal ions. In view of this, more examples of this kind of polynuclear complex are needed in order to perform detailed theoretical and experimental studies on the ability of the amido-bridging ligands to mediate magnetic exchange interactions.…”

(Alkyliminomethyl)phenylamido and related complexes of zirconium and titanium

“…We initiated a study in this area using the ligand backbones shown in Scheme 1. In the first of a series of papers we report on zirconium and titanium complexes with the N-silyl (R 1 = SiMe 3 , SiMe 2 Bu t ) substituted analogues of L. As previously noted, 5 L is related to a wide family of β-diketiminato ligands. 6…”

“…The o-[(tert-butyl)iminomethyl]aniline was synthesised by the literature method. 5 Following this method, condensation of Bu t NH 2 with the commercially available o-aminoacetophenone did not proceed even under forcing conditions and prolonged reaction times. However, reaction with cyclohexylamine in toluene in the presence of 4 Å molecular sieves afforded multigram quantities of the Schiff base in excellent yields.…”

“…3 The attractive features of these ligands are easy synthetic accessibility and steric and electronic tuning by substitution of the aromatic ring or the imine carbon. 3,4 In contrast, the coordination chemistry of the anionic ligands that formally originate from salicylaldiminato by replacement of the PhO Ϫ group with the isoelectronic PhNR Ϫ have received less attention, 5 even though the tuning opportunities in this case are even broader (Scheme 1).…”

Touching the upper limit for ferromagnetic interactions in hetero-bridged dinuclear [Cu 2 II ] complexes using a novel N 5 -dinucleating ligand bearing an endogenous monoatomic amido(R–NH − )-bridging group

“…Polynuclear metal complexes bearing either amido (R,R 0 -N À or R-NH À ) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] or hydrazido (R,R 0 -N-N 2À or R, R 0 -N-NH À ) 17,18 monoatomic bridging ligands are rather rare species, most of them being organometallic in nature, that have been prepared under anaerobic reaction conditions. Amongst amido-bridged polynuclear complexes containing paramagnetic metal ions [1][2][3][4][5][6][7][8][9][10][11][12][13] those that were magneto-structurally studied [5][6][7][8][11][12][13] invariably showed antiferromagnetic interactions between metal ions. In view of this, more examples of this kind of polynuclear complex are needed in order to perform detailed theoretical and experimental studies on the ability of the amido-bridging ligands to mediate magnetic exchange interactions.…”

(Alkyliminomethyl)phenylamido and related complexes of zirconium and titanium

“…We initiated a study in this area using the ligand backbones shown in Scheme 1. In the first of a series of papers we report on zirconium and titanium complexes with the N-silyl (R 1 = SiMe 3 , SiMe 2 Bu t ) substituted analogues of L. As previously noted, 5 L is related to a wide family of β-diketiminato ligands. 6…”

“…The o-[(tert-butyl)iminomethyl]aniline was synthesised by the literature method. 5 Following this method, condensation of Bu t NH 2 with the commercially available o-aminoacetophenone did not proceed even under forcing conditions and prolonged reaction times. However, reaction with cyclohexylamine in toluene in the presence of 4 Å molecular sieves afforded multigram quantities of the Schiff base in excellent yields.…”

“…3 The attractive features of these ligands are easy synthetic accessibility and steric and electronic tuning by substitution of the aromatic ring or the imine carbon. 3,4 In contrast, the coordination chemistry of the anionic ligands that formally originate from salicylaldiminato by replacement of the PhO Ϫ group with the isoelectronic PhNR Ϫ have received less attention, 5 even though the tuning opportunities in this case are even broader (Scheme 1).…”

Touching the upper limit for ferromagnetic interactions in hetero-bridged dinuclear [Cu 2 II ] complexes using a novel N 5 -dinucleating ligand bearing an endogenous monoatomic amido(R–NH − )-bridging group

“…Polynuclear metal complexes bearing either amido (R,R 0 -N À or R-NH À ) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] or hydrazido (R,R 0 -N-N 2À or R, R 0 -N-NH À ) 17,18 monoatomic bridging ligands are rather rare species, most of them being organometallic in nature, that have been prepared under anaerobic reaction conditions. Amongst amido-bridged polynuclear complexes containing paramagnetic metal ions [1][2][3][4][5][6][7][8][9][10][11][12][13] those that were magneto-structurally studied [5][6][7][8][11][12][13] invariably showed antiferromagnetic interactions between metal ions. In view of this, more examples of this kind of polynuclear complex are needed in order to perform detailed theoretical and experimental studies on the ability of the amido-bridging ligands to mediate magnetic exchange interactions.…”