Yingzhong Shen

Synthesis and characterization of dialkylgallium (dialkylindium) complexes of N-salicylidene 2-aminopyridine and N-salicylidene 2-methoxyaniline: crystal structure of dimethyl[N-salicylidene 2-aminopyridine]gallium

Abstract Reaction of trimethylgallium (trimethylindium) and triethylgallium (triethylindium) with N -salicylidene 2-aminopyridine or N -salicylidene 2-methoxyaniline in benzene solution yields seven intramolecular coordinated Group 13 metal Schiff-base complexes. All complexes obtained were characterized by elemental analysis, 1 H-NMR, IR and mass spectrometry. The structure of dimethyl[ N -salicylidene 2-aminopyridine]gallium ( 1 ) was determined by X-ray single crystal analysis. The Ga atom is four coordinate in the structure. Photoluminescent emission spectra of complexes dimethyl[ N -salicylidene 2-aminopyridine]gallium ( 1 ), diethyl[ N -salicylidene 2-aminopyridine]gallium ( 3 ), diethyl[ N -salicylidene 2-aminopyridine]indium ( 4 ) and dimethyl[ N -salicylidene 2-methoxylaniline]gallium ( 5 ) were measured. The maximum emission wavelength is between 503 and 511 nm, respectively on radiation by UV light.

Phosphanstabilisierte Silber(I)–Carboxylate: Synthese und Verwendung in der Silber-CVD

Abstract The synthesis of the silver(I)–carboxylate complexes [(R′ 3 P) n AgO 2 CR] ( n =1, R′= n Bu: 3a , R=CF 3 ; 3b , R=C 2 F 5 ; R′=C 6 H 4 CH 2 NMe 2 -2: 3c , R=CF 3 ; 3d , R=C 2 F 5 ; n =2, R′= n Bu: 4a , R=CF 3 ; 4b : R=C 2 F 5 ) succeeds, when [AgO 2 CR] ( 1a , R=CF 3 ; 1b , R=C 2 F 5 ) is reacted with n equivalents of PR′ 3 ( 2a , R′= n Bu; 2b , R′=C 6 H 4 CH 2 NMe 2 -2) ( n =1, 2); the yield amounts to 83–98%. Complexes 3 and 4 can be used for the deposition of silver on titaniumnitride-coated SiO 2 -wafers by the chemical vapour deposition (CVD) process, which could be shown by applying 4a as suitable precursor. REM studies show that closed silver layers were formed with a silver particle size between 50 and 100 nm.

Synthesis and characterisation of alkyl-N,N′-bis(salicylidene)ethylenediamino- and alkyl-N,N′-bis(salicylidene)-1,2-phenylenediaminogallium or indium complexes: crystal structure of methyl-N,N′-bis(salicylidene)-1,2-phenylenediaminoindium

Abstract The reaction of trialkylgallium or indium R3M (M=In, Ga; R=Me, Et) with N,N′-ethylenebis(salicylideneimine) or 1,2-N,N′-phenylenebis(salicylideneimine) yields seven intramolecularly coordinated organogallium or organoindium complexes. Two hydroxyl protons in the ligands react with both trialkylindium and trimethylgallium, while one hydroxyl group reacts exclusively with triethylgallium. The complexes obtained have been fully characterised by elemental analysis, 1H-NMR, IR and mass spectroscopy. The structure of methyl-N,N′-bis(salicylidene)-1,2-phenylenediaminoindium (1) has been determined by single-crystal X-ray analysis. The In atom is five coordinate in the structure. Fluorescence spectroscopy has shown that the maximum emission wavelength of 1 is 499 nm upon radiation by UV light.

Blue-green variable light-emitting diode based on organic–molecule-doped polymer

Monolayer organic light-emitting diodes based on the organic molecule [(3,4-dimethoxybenzyldehycle-2′-hydroxy naphthylimine)dimethyl gallium]-doped [poly(2-mehtyoxy-5-ethyloxy)-4-di-(2-methyoxy-5′-octaoxy)phenylene vinylene] have been fabricated by a spin-coating method. Color variation from green to blue has been observed. The results have been attributed to the variation of the recombination zone and the charge transfer between the materials.

Synthesis, structural characterization and electroluminescence study of alkylgallium derivatives of thiobenzhydrazones

Six dimethylgallium complexes of type Me 2 GaL [L= N -benzylidenethiobenzahydrazonato ( 1 ), N -(4-methoxy)benzylidenethiobenzahydrazonato ( 2 ), N -(3,4-dimethoxy)benzylidenethiobenzahydrazonato ( 3 ), N -(4- N , N -dimethylamino)benzylidenethiobenzahydrazonato ( 4 ), N -(2-naphthyl)methylenethiobenzahydrazonato ( 5 ) and N -(9-anthryl)methylenethiobenzahydrazonato ( 6 )] have been synthesized by reaction of trimethylgallium with appropriate N -arylmethylenethiobenzahydrazones. The complexes obtained have been characterized by elemental analysis, 1 H-NMR, IR and mass spectroscopy. Structure of 2 has been determined by X-ray single-crystal analysis, in which Ga atom is four-coordinated. Compounds 2 – 4 emit blue colors at λ max =432–479 nm when irradiated by UV light. The electroluminescent (EL) properties of 2 , 3 and 4 were examined by fabricating EL devices using 2 , 3 and 4 as emitter, respectively. The EL bands are located in the blue region (451, 454 and 479 nm for complexes 2 , 3 and 4 , respectively).

Synthesis and characterization of dialkylaluminum, -gallium or -indium[2-(2-pyridyl)]ethoxides: Crystal structure of [Me2In{μ–O–CH2CH2(2-C5H4N)}]2

Abstract Six complexes of intramolecular coordinated dimetallic alkoxides [R2M{μ–O–CH2CH2(2-C5H4N)}]2 (M=Al, Ga, In; R=Me, Et) have been obtained by reactions of 2-(2-pyridyl)ethanol with R3M in 1:1 ratio in high yields. The compounds have been characterized by elemental analysis, 1H NMR and mass spectroscopy. A molecular structure of [(CH3)2In{μ–O–CH2CH2(2-C5H4N)}]2 has been determined by single crystal X-ray analysis.

Synthesis and characterization of bis(1,1,1,5,5,5,-hexafluoropentane-2,4-ionato) strontium and barium adducts with O- and N- ancillary ligands; crystal structure of Sr(HFAC)2 · (BPY)2

Abstract Complexes of M(hfac) 2 ·Ln [M = Sr, n = 1, L = tetraglyme, db24c8; n = 2, L = bpy, phen; M = Ba, n = 1, L = tetraglyme, db24c8] have been prepared by in situ reactions of MX 2 (X = OH, OAc) with Hhfac in the presence of the ancillary ligands in aqueous ethanol in high yields and characterized by 1 H NMR, IR, mass spectrometry and elemental analysis. A molecular structure of the complex Sr(hfac) 2 · (bpy) 2 has been determined by X-ray single crystal analysis.

Synthesis of Functionalized p-Phenylene Oxide Oligomers

Abstract Oligomers of p-phenylene oxides have been synthesized by coupling of substituted phenols and aryl bromides in the presence of cuprous chloride. The chain length varies from 2 to 5 phenyl rings functionalized at one end by an OH and OMe group and at the other end by an OH, OMe or NO2 functions. The oligomers could be used in material science and as building blocks in supramolecular chemistry. Methods for chemoselective demethylation of methoxy groups were developed.