Dinuclear Complexes of Chiral Tetradentate Pyridylimine Ligands:  Diastereoselectivity, Positive Cooperativity, Anion Selectivity, Ligand Self-Sorting Based on Chirality, and Magnetism

Telfer, Shane G.; Sato, Tomohiro; Kuroda, Reiko; Lefebvre, Julie; Leznoff, Daniel B.

doi:10.1021/ic034585k

Cited by 80 publications

(44 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The amine Ν atoms of the pendant propylaminomethyl units are protonated and do not take part in the coordination to the Co atom. The bond lengths and angles subtended at the Co center are typical and comparable to the values observed in other cobalt(II) complexes derived from Schiff bases [8][9][10]. The title compound crystallizes isostructurally with the analogous Zn compound [11].…”

Section: Discussionsupporting

confidence: 71%

Crystal structure of bis(4-bromo-2-((3-methylaminopropylimino)- methyl)phenolato)cobalt(II) dinitrate, [Co(C11H15BrN2O)2][NO3]2

Wang¹,

Pu²

2006

Zeitschrift Für Kristallographie - New Crystal Structures

View full text Add to dashboard Cite

DiscussionCobalt complexes of Schiff bases have been extensively studied. They play an important role in both synthetic and structural research [1][2][3]. In addition, recent investigations have shown that certain cobalt complexes are potent antiviral reagents [4], As an extension of our work on the structural characterization of Schiff base complexes [5][6][7], a new mononuclear Schiff base cobalt(II) complex is reported here. The Co(II) atom located on the inversion center is four-coordinated by two Ο and two imine Ν atoms from two Schiff base ligands, forming a tetrahedral environment. The amine Ν atoms of the pendant propylaminomethyl units are protonated and do not take part in the coordination to the Co atom. The bond lengths and angles subtended at the Co center are typical and comparable to the values observed in other cobalt(II) complexes derived from Schiff bases [8][9][10]. The title compound crystallizes isostructurally with the analogous Zn compound [11]. Source of materialReagents and solvents used were of commercially available quality. 5-Bromo-2-hydroxybenzaldehyde (201.2 mg, 1.0 mmol), Nmethyl-l,3-diaminopropane (88.3 mg, 1.0 mmol) and Co(NÜ3)2 · 4H2O (127.5 mg, 0.5 mmol) were dissolved in ethanol (80 ml). The mixture was stirred for 20 min at room temperature to give a clear brown solution. Red block-shaped crystals, suitable for Xray structure determination were formed by slow evaporation of the solution in dark for a week. Elemental analysis -found: C, 36.20 %; H, 4.33 %; N, 11.72 %; calc. for C22H3oBr 2 CoN 6 08: C, 36.43 %; H, 4.17 %; Ν, 11.59 %.

show abstract

Section: Discussionsupporting

confidence: 71%

Crystal structure of bis(4-bromo-2-((3-methylaminopropylimino)- methyl)phenolato)cobalt(II) dinitrate, [Co(C11H15BrN2O)2][NO3]2

Wang¹,

Pu²

2006

Zeitschrift Für Kristallographie - New Crystal Structures

View full text Add to dashboard Cite

show abstract

“…As expected, the cyclohexyl ring adopts ac hair conformation. The bond lengths and angles are comparable with those observed for the similar complexes [9][10][11]. …”

supporting

confidence: 84%

Crystal structure of bis(1-(3-(cyclohexylammonio)propyliminomethyl)-2- naphtholato)cobalt(II) methanol disolvate, Co(C20H25N2O)2 · 2CH3OH

Diao¹,

Li²,

Kang³

2008

Zeitschrift Für Kristallographie - New Crystal Structures

View full text Add to dashboard Cite

Source of materialAll the reagentsu sed were of commercially grade and without further purification. 2-Hydroxy-1-naphthaldehyde (0.2 mmol, 35.1 mg), N-cyclohexyl-1,3-diaminopropane (0.2 mmol, 31.3 mg), and Co(NO 3 ) 2 ·6H 2 O(0.1 mmol, 29.1 mg) were dissolved in a methanol solution (10 ml). The mixturewas stirred at room temperaturefor 10 min to give aclear red solution.After keeping the solution in air for 5days, red block-like crystals were collected by filtration. Elemental analysis -found: C, 69.2 %; H, 7.6 %; N, 7.8 %; calc. for C42H58CoN4O4:C,69.4 %; H, 7.7 %; N, 7.9 %. Experimental detailsAtom H2A was located in aFourier differencemap and refined with the N-H distancerestrained to 0.90(1) Å and with U iso (H) value fixed at 0.08 Å 2 .The other Hatoms were placed in idealized positions and constrained to ride on their parent atoms with C-H distancesof0.93-0.97 Å,with U iso (H) set to 1.2U eq (C). The unit cell contains solvent-accessible voids of 183 Å 3 ,which accommodate two disordered methanolmolecules which are confirmed by the chemicalanalysis, but could not be determined from the diffuse difference Fourier map. DiscussionCobalt(II) complexes with Schiff base ligands have received much attention in recent years [1][2][3][4]. Some of the complexes have been foundtohave pharmacologicaland antitumor properties [5][6][7]. Recently,wehave reported atrinuclear Schiff basecobalt(II) complex [8]. In order to further develop the coordination chemistry of such complexes, we report herein the titlenew cobalt(II) complex. The title complex is ac entrosymmetric mononuclear cobalt(II) complex. The central Co atom is six-coordinated by two phenolate O, two imine Nand two amine Natoms from two Schiff base ligands, forming an octahedral environment. The chelate ring formed by the atoms Co1, N1, C12-C14,and N2 has aboat conformation. The diagonally positioned atoms, Co1 and C13, are shifted from the least-squaresplane through the atoms N1, N2, C12, and C14 by 0.613(2) Å and 0.467(3) Å,respectively. As expected, the cyclohexyl ring adopts ac hair conformation. The bond lengths and angles are comparable with those observed for the similar complexes [9][10][11].

show abstract

“…The Co II atom in the title complex is four-coordinated by two O and two N atoms from two Schiff base ligands, forming a tetrahedral coordination. All the bond lengths and angles subtended at the Co center are comparable to the corresponding values observed in other Schiff base cobalt complexes [5][6][7]. …”

supporting

confidence: 82%

Crystal structure of bis(cyclopropyl-4-bromosalicylaldiminato)cobalt(II), Co(C20H18BrNO)2

Wei

Wang

2006

Zeitschrift Für Kristallographie - New Crystal Structures

View full text Add to dashboard Cite

Source of materialReagents and solvents used were of commercially available quality. 5-Bromosalicylaldehyde (201.3 mg, 1.0 mmol), cyclopropylamine (57.2 mg, 1.0 mmol) and Co(CH 3 COO) 2 · 6H 2 O (142.6 mg, 0.5 mmol) were stirred and refluxed in ethanol at about 351 K for 30 min to give a red solution. Red block-shaped crystals, suitable for X-ray structural determination were formed by slow evaporation of the solution in dark for about a week. Elemental analysis found: C, 44.89 %; H, 3.45 %; N, 5.13 %; calc. for C20H18Br2CoN2O2: C, 44.72 %; H, 3.38 %; N, 5.22 %. Experimental detailsThe large ADP anisotropy for the C9 and C10 atoms is due to the disorder of the C8/C9/C10 cyclopropane ring. DiscussionCobalt complexes of Schiff bases have been extensively studied. They play an important role in both synthetic and structural research [1][2][3]. Recent research show that certain cobalt complexes are potent antiviral reagents [4]. Herein we report the synthesis and crystal structure of a cobalt(II) complex derived from the Schiff base 4-bromo-2-(cyclopropyliminomethyl)phenol. The Co II atom in the title complex is four-coordinated by two O and two N atoms from two Schiff base ligands, forming a tetrahedral coordination. All the bond lengths and angles subtended at the Co center are comparable to the corresponding values observed in other Schiff base cobalt complexes [5][6][7].

show abstract

Dinuclear Complexes of Chiral Tetradentate Pyridylimine Ligands: Diastereoselectivity, Positive Cooperativity, Anion Selectivity, Ligand Self-Sorting Based on Chirality, and Magnetism

Cited by 80 publications

References 32 publications

Crystal structure of bis(4-bromo-2-((3-methylaminopropylimino)- methyl)phenolato)cobalt(II) dinitrate, [Co(C11H15BrN2O)2][NO3]2

Crystal structure of bis(4-bromo-2-((3-methylaminopropylimino)- methyl)phenolato)cobalt(II) dinitrate, [Co(C11H15BrN2O)2][NO3]2

Crystal structure of bis(1-(3-(cyclohexylammonio)propyliminomethyl)-2- naphtholato)cobalt(II) methanol disolvate, Co(C20H25N2O)2 · 2CH3OH

Crystal structure of bis(cyclopropyl-4-bromosalicylaldiminato)cobalt(II), Co(C20H18BrNO)2

Contact Info

Product

Resources

About