17745-88-9Relevant academic research and scientific papers
C{double bond, long}N{single bond}N{double bond, long}C conformational isomers of 2′-hydroxyacetophenone azine: FTIR matrix isolation and DFT study
Grzegorzek, Joanna,Mielke, Zofia,Filarowski, Aleksander
, p. 371 - 376 (2010)
2′-hydroxyacetophenone azine (APA) has been studied by matrix isolation infrared spectroscopy and quantum chemical calculations. The DFT/B3LYP/6-311++G(2d,2p) calculations demonstrated the existence of two conformers for the lowest energy E/E configuratio
Synthesis and characterization of hydrazone and azine derivatives of bis(cyclopentadienyI) titanium(IV)
Kaushik, Narender Kumar,Khera, Brij,Sharma, Anand Kumar
, p. 793 - 794 (2021/11/22)
Pentacoordinated hydrazone and azine derivatives of bis(cyclopentadienyl)titanium(IV) of the type {equation presented}, have been prepared. The products were characterized by chemical analyses, elec- trical conductance, IR, 1H NMR, and electronic spectral studies. Some hydrazone complexes and a few azine com- plexes of titanium have been studied.' ' However, no systematic study on their organometallic derivatives is available. In view of the versatile chelating ability, widespread applications and lack of data involving organometallic derivatives of titanium, it has been considered of interest to study the reactions of Cp2TiCl2 with the title ligands.
Tungsten hexachloride nanoparticles loaded on montmorillonite K-10: a novel solid acid catalyst in the synthesis of symmetrical and unsymmetrical azines
Safari, Javad,Gandomi-Ravandi, Soheila,Shariat, Saeedeh
, p. 1499 - 1507 (2016/07/06)
In the present investigation, we have developed a novel technique to prepare azines using nano-WCl6 loaded on Montmorillonite K10 clay as a highly active catalyst. A variety of aldehydes and ketones were efficiently converted to the corresponding azines using catalytic amounts of nanosized WCl6/Mont. K10 under mild conditions. The nanostructures of WCl6 loaded on Mont. K10 as solid acid catalyst have been prepared by solid dispersion method. The advantages of this catalyst are rapid completion of the reactions, simplicity of performance, lack of pollution and mild and green reaction conditions. The morphologies, structure, and chemical components of parent and modified clay were successfully characterized using SEM, FT-IR, CV, XRD and EDX measurements.
Improvement in Titanium Complexes Bearing Schiff Base Ligands in the Ring-Opening Polymerization of L-Lactide: A Dinuclear System with Hydrazine-Bridging Schiff Base Ligands
Tseng, Hsi-Ching,Chen, Hsing-Yin,Huang, Yen-Tzu,Lu, Wei-Yi,Chang, Yu-Lun,Chiang, Michael Y.,Lai, Yi-Chun,Chen, Hsuan-Ying
, p. 1642 - 1650 (2016/02/27)
A series of titanium (Ti) complexes bearing hydrazine-bridging Schiff base ligands were synthesized and investigated as catalysts for the ring-opening polymerization (ROP) of L-lactide (LA). Complexes with electron withdrawing or steric bulky groups reduced the catalytic activity. In addition, the steric bulky substituent on the imine groups reduced the space around the Ti atom and then reduced LA coordination with Ti atom, thereby reducing catalytic activity. All the dinuclear Ti complexes exhibited higher catalytic activity (approximately 10-60-fold) than mononuclear LCl-H-TiOPr2 did. The strategy of bridging dinuclear Ti complexes with isopropoxide groups in the ROP of LA was successful, and adjusting the crowded heptacoordinated transition state by the bridging isopropoxide groups may be the key to our successful strategy.
Ruthenium(II)/(in) bipyridine heterochelates incorporating phenolato imine functionalities. Synthesis, crystal structure, spectroscopic and electron-transfer properties and solution reactivities
Chakraborty, Soma,Walawalkar, Mrinalini G.,Lahiri, Goutam Kumar
, p. 2875 - 2883 (2007/10/03)
A new class of ruthenium-bipyridine complexes of the type [Ru(bpy)2(L′)]CIO4 [bpy = 2, 2′-bipyridine; L′ = OC6H3(R)C(R′)=NH; R = R′ = H la; R = H, R′ = CH3 lb; R = NO2, R′ = H le] have been synthesized via cleavage of N-N and N-C (aliphatic and aromatic) bonds of binucleating imine functionalities. The formation of 1 has been authenticated by the single crystal structure determination of la. The complexes exhibit strong MLCT transitions in the visible region and intraligand transitions in the UV region and display moderately strong emission near 700 nm. The quantum yield () of the emission process at 77 K (EtOH-MeOH, 4:1 glass) varies in the range 2.2 × 10-2-6.5 × 10-3 depending on L′ in 1. The complexes show ruthenium(iii)-ruthenium(n) and ruthenium(iv)ruthenium(ni) oxidations in the ranges 0.52-0.77 and 1.71-1.97 V versus SCE respectively. For la and Ib, one ligand centred oxidation near 2 V and for all the complexes two bipyridine based reductions have been detected in the ranges - 1.51 to -1.56 V and -1.72 to -1.79 V versus SCE. Coulometric oxidation of 1 initially generates the unstable trivalent one-electron paramagnetic [Ru"′(bpy)2(L′)]2+ congener, 1+. The complexes 1+ display one broad and moderately strong LMCT band near 750 nm and intraligand transitions in the UV region. The oxidised complexes 1+ exhibit rhombic EPR spectra at 77 K which have been analysed to furnish values of distortion parameters (A = 4543-5923 cm-1, V= 3251-5127 cm′1) and energy of the expected ligand field transitions (v, 3086-3508, V2 6409-8669 cm-1) within the t2 shell. One of the ligand field transitions has been experimentally observed (v2 7092-7812 cm-1). The oxidised species 1+ slowly changes to diamagnetic dimeric species of the type [(bpy)2RuIIIrOC6H 3(R)C(R>NNC(R′)(R)C6H3Cr}Ru III(bpy)2]4+ 2 where the ruthenium(ni) centres are antiferromagnetically coupled. In the presence of water 1+ as well as 2 return to the parent bivalent species 1. The second order rate constants (k) of the conversion process 1+2 in dry acetonitrile and first order rate constants (k′) of 1+→ 1 in ordinary acetonitrile and the thermodynamic parameters (ΔH+ and ΔS+) of both have been determined spectrophotometrically in the temperature range 303-333 K. The Royal Society of Chemistry 2000.
Synthesis and Characterization of Hydrazone and Azine Derivatives of Bis(cyclopentadienyl)titanium(IV)
Khera, Brij,Sharma, Anand Kumar,Kaushik, Narender Kumar
, p. 793 - 794 (2007/10/02)
Pentacoordinated hydrazone and azine derivatives of bis(cyclopentadienyl)titanium(IV) of the type and , where R=H or CH3, R'=H, C6H5 or C6H3(NO2)2 and R''=H or CH3 have been prepared.The products were characterized by chemical analyses, electrical conductance, IR, 1H NMR, and electronic spectral studies.
Synthesis and characterization of hydrazone and azine derivatives of bis(cyclopentadienyl)zirconium(IV)
Khera, B.,Sharma, A. K.,Kaushik, N. K.
, p. 172 - 174 (2007/10/02)
Pentacoordinated hydrazone and azine derivatives of bis(cyclopentadienyl)zirconium(IV) of the type and , where R = H or CH3 and R' = H, C6H5 or C6H3(NO2)2, have been synthesized by the reaction of bis(cyclopentadienyl)zirconium(IV) dichloride with the appropriate hydrazone or azine in equimolar ratios in refluxing tetrahydrofuran.The products were characterized by chemical analyses, electrical conductance, IR, 1H NMR and electronic spectral studies.
PREPARATION AND CHARACTERIZATION OF ALDAZINATE AND KETAZINATE DERIVATIVES OF NIOBIUM(V)
Mookerjee, Manabrenda Nath,Singh, Ran Vir,Tandon, Jagdish Prasad
, p. 109 - 114 (2007/10/02)
The reaction of niobium pentaisopropoxide with bibasic tridentate azines (HOC6H4CH=N-N=CHC6H4OH, HOC10H6CH=N-N=CHC10H6OH, and HOC6H4C(CH3)=N-N=C(CH3)C6H4OH) have been investigated in 1:1, 1:2, 1:3 and 2:5 molar ratios in anhydrous benzene.The resulting new derivatives Nb(OPri)3(AZ)2, Nb(OPri)(AZ)2, Nb(AZH)(AZ)2, and Nb2(AZ)5 (where AZ(2-) represents the anion of the azine AZH2) have been characterized by elemental analyses, molecular weight determinations, conductance measurements, and IR, UV and 1H-NMR spectral studies.The integral procedural decomposition temperature (IPDT) of triisopropoxymono(salicylaldehyde azinato)niobium(V), monoisopropoxybis(salicylaldehyde azinato)niobium(V), tris(salicylaldehyde azinato)niobium(V), tri-t-butoxymono(salicylaldehyde azinato)niobium(V), and mono-t-butoxybis(salicylaldehyde azinato)niobium(V) complexes have been calculated and the overall thermal stability of these complexes compared.
