183659-47-4

Upstream product

• 148-53-8 3-methoxy-2-hydroxybenzaldehyde 
• 2243-62-1 1,5-naphthalenediamine 
• 1280575-75-8 6,6′-((1E,1′E)-(naphthalene-1,5-diylbis(azaneylylidene))bis(methaneylylidene))bis(2-methoxyphenol) 

Downstream Products

• 1280575-75-8 6,6′-((1E,1′E)-(naphthalene-1,5-diylbis(azaneylylidene))bis(methaneylylidene))bis(2-methoxyphenol) 

Relevant academic research and scientific papers

Effect of π-aromatic spacers on the magnetic properties and slow relaxation of double stranded metallacyclophanes with a LnIII–MII–MII–LnIII (LnIII?=?GdIII, DyIII, YIII

The coordination-driven self-assembly of two polydentate linear Schiff base ligands (either N,N-bis(2-hydroxy-3-methoxy-benzyliden)-1,4-diaminobenzene, L2, or N,N-bis(2-hydroxy-3-methoxy-benzyliden)-1,5-diaminonaphthalene, L3) with two transition metal io

Self-assembly of luminescent 12-metal Zn-Ln planar nanoclusters with sensing properties towards nitro explosives

Two types of Zn-Ln nanoclusters [Nd2Zn2L2(L′)2(OAc)2(NO3)2(H2O)2] (1) and [Ln6Zn6L2(L′′)2O2(OAc)18] (Ln = Nd (2) and Sm (3)) were prepared using one long Schiff base ligand (H2L) with a naphthyl backbone and two short polydentate ligands (H2L′ and H2L′′). 1 and 2-3 show linear and planar structures with sizes of approximately 10 × 10 × 30 ? and 10 × 15 × 22 ?, respectively. The chromogenic Zn/ligand components can act as efficient sensitizers for lanthanide luminescence, and thus 1-3 show visible and NIR emissions. In these clusters, the Schiff base ligands display a “U-shaped” configuration, which is suitable to form ππ interactions and hydrogen bonds with nitro aromatic compounds. Interestingly, Zn-Sm cluster 3 shows visible and NIR luminescence sensing of nitro explosives and exhibits high sensitivity to 1,4-DNB and TNT at the ppb level.

Polymorphism driven optical properties of an anil dye

Red crystals of N,N′-bis(3-methoxysalicylidene)-1,5-diiminonaphthalene were obtained after Schiff base condensation in ethanol. Recrystallization from acetone afforded yellow crystals, a process which is reversible and reproducible. Single crystal X-ray diffraction evidences two polymorphs differing in their space group and dihedral angle between aromatic moieties. DFT periodic calculations further confirmed the existence of two minima on the potential energy surface corresponding to red and yellow crystals. The red polymorph irreversibly (monotropically) transforms at 165-190 °C into the yellow one with a 3% increase of the unit cell volume, as shown by X-ray powder diffraction and periodic DFT calculations. Both polymorphs are thermochromic but only the red one displays photochromism upon irradiation at λ = 365 nm, which is reversible and exhibits a relatively slow thermal relaxation. A temperature induced cis/trans-keto equilibrium is for the first time identified for an N-salicylidene aniline derivative. Static DFT molecular and periodic calculations as well as ab initio Born-Oppenheimer dynamics simulations were performed to characterize the stability of both polymorphs and to determine the relative populations of the enol/cis-keto/trans-keto isomers at various temperatures.

Tetradentate Schiff base ligands and their complexes: Synthesis, structural characterization, thermal, electrochemical and alkane oxidation

Three Schiff base ligands (H2L1-H2L 3) with N2O2 donor sites were synthesized by condensation of 1,5-diaminonapthalene with benzaldehyde derivatives. A series of Cu(II), Co(II), Ni(II), Mn(II) and Cr(III) complexes were prepared and characterized by spectroscopic and analytical methods. Thermal, electrochemical and alkane oxidation reactions of the ligands and their metal complexes were investigated. Extensive application of 1D (1H, 13C NMR) and 2D (COSY, HETCOR, HMBC and TOSCY) NMR techniques were used to characterize the structures of the ligands and establish the 1H and 13C resonance assignments of the three ligands. Ligands H2L1 and H2L3 were obtained as single crystals from THF solution and characterized by X-ray diffraction. Both molecules are centrosymmetric and asymmetric unit contains one half of the molecule. Catalytic alkane oxidation reactions with the transition metal complexes investigated using cyclohexane and cyclooctane as substrates. The Cu(II) and Cr(III) complexes showed good catalytic activity in the oxidation of cyclohexane and cyclooctane to desired oxidized products. Electrochemical and thermal properties of the compounds were also investigated.