1,721,146 research outputs found
NEW MOLECULAR-HYDROGEN IRON(II) COMPLEXES - SYNTHESIS, CHARACTERIZATION, AND REACTIVITY WITH ARYLDIAZONIUM CATIONS
No full textDihydrogen complexes of the type [FeH(η2-H2)P4]BPh4[P = PhP(OEt)2 and P(OEt)3] were prepared by allowing the dihydride FeH2P4 to react at -80 °C with HBF4•Et2O in ethanol. Variable-temperature 1H and 31P{1H} NMR spectra and T1 measurements of the complexes are reported. Ligand-substitution reactions with CO, isocyanide, nitrile, and phosphite afforded the new monohydrides [FeHLP4]BPh4 [L = CO, 4-CH3C6H4NC, 4-CH3OC6H4NC, 4-ClC6H4NC, 2,6-(CH3)2C6H3NC, 4-CH3C6H4CN, CH3(CH2)2CN, P(OEt)3, and PhP(OEt)2]. Furthermore, the reactivity with aryldiazonium cations of both molecular hydrogen [FeH(η2-H2)P4] +and hydride [FeHLP4]+derivatives was examined and led to the synthesis of bis-(aryldiazenido) [Fe(ArN2)2P3]2+(Ar = 4-CH3C6H4and 4-CH3OC6H4) and monodiazene [Fe(ArN=NH)LP4]2+ (L = nitrile) complexes, respectively. Their characterization by infrared, 1H, and 31P{1H} NMR data is also reported. © 1989, American Chemical Society. All rights reserved
Preparation and Properties of New Pentacoordinate Iron Nitrosyl Complexes
No full textOur interest in the chemistry of the nitrosyl complexes has been mainly devoted to the use of monodentate phosphite as coligand, and in this context, the syntheses of pentacoordinate {Co(NO)}8 complexes1 of the type [CoXL3(NO)]+ and [CoL4(NO)]2+ have recently been reported.2 Similar investigations carried out on iron(II) halides by using gaseous NO allowed us to obtain new pentacoordinate [FeL4(NO)]+ (L = phosphite) derivatives, which are described in the present report. Furthermore, whereas some iron nitrosyl compounds also containing CO have been described, 3 no example of iso-cyanide-phosphine derivatives known to us has yetbeen reported. Therefore, in this paper we also present the reactivity of the [FeL4(NO)]+ species with isocyanides, leading to the synthesis of the first nitrosyl isocyanides-phosphite mixedligand complexes. © 1984, American Chemical Society. All rights reserved
Arenediazonium Complexes of Cobalt(I): Synthesis and Properties
No full textArenediazonium complexes of cobalt(I) of the type [Co(RN2)L4] [BPh4]2 [L = P(OEt)2Ph, P(OEt)3, or P(OMe)3; R = 4-CH3C6H4, 3-CH3C6H4, 2-CH3C6H4, C6H5, 4-CH3OC6H4, 4-ClC6H4, or 4-FC6H4] have been prepared; their characterization by i.r., 1H, and 31P-{1H} n.m.r. spectra is reported. Reactivity with π-acceptor ligands such as CO, NO, isocyanide, and phosphite is also described. Finally, the reaction of the arenediazonium complexes with chloride ions affording the cobalt(II) derivatives [CoClL4]+ has been investigated; the function of RN2 as an oxidizing agent in this reaction is also discussed
Preparation of dinitrogen complexes Mo(N2)2P4 stabilised by phosphonite PPh(OEt)2 and phosphinite PPh2(OEt) ligands
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Preparation and reactivity of osmium(II) hydride complexes with phosphites and polypyridyls
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Preparation of methylhydrazine and methyldiazene complexes of molybdenum and tungsten
No full textNitrosyl complexes [M(CO) 3(NO)L 2]BPh 4 (2, 5) [M = Mo, W; L = PPh(OEt) 2, PPh 2OEt] were prepared by allowing carbonyl compounds M(CO) 4L 2 (1, 4) to react with NOPF 6 in CH 2Cl 2. Dicarbonyl complex [W(CO) 2(NO){PPh(OEt) 2} 3]BPh 4 (7) was also prepared by reacting W(CO) 3[PPh(OEt) 2] 3 (6) with NOPF 6. Treatment of nitrosyl complexes 2, 5 with [NEt 4]Br gave bromide derivative [MBr(CO) 2(NO)L 2]BPh 4 (3). Hydrazine complexes [M(CO)(RNHNH 2)(NO)L 3]BPh 4 (8, 9, 10) (R = H, CH 3) were prepared by allowing nitrosyl complexes 2, 5 to react with hydrazine RNHNH 2 in CH 2Cl 2. Reaction of methylhydrazine complexes [M(CO)(CH 3NHNH 2)(NO)L 3]BPh 4 (8, 10) with Pb(OAc) 4 at -30°C resulted in selective oxidation of hydrazine, affording the corresponding methyldiazene derivatives [M(CO)(CH 3NNH)(NO)L 3]BPh 4 (11, 12). The complexes were characterised spectroscopically (IR and NMR), and a geometry in solution was also established. © 2012 Elsevier Ltd. All rights reserved
Preparation and reactivity of stannyl and germyl complexes of cobalt
No full textTrichlorostannyl complex Co(SnCl 3)(CO) 2(PPh 3) 2 (1) was prepared by allowing the chloro compound CoCl(CO) 2(PPh 3) 2 to react with SnCl 2·2H 2O. Instead, treatment of the iodo complex CoI(CO) 2[PPh(OEt) 2] 2 with SnCl 2·2H 2O afforded a mixture of Co(SnCl 2I)(CO) 2[PPh(OEt) 2] 2 (2a) and Co(SnCl 3)(CO) 2[PPh(OEt) 2] 2 (2b) derivatives. Trichlorogermyl complexes Co(GeCl 3)(CO) 2L 2 (3, 4) [L = PPh 3, PPh(OEt) 2] were prepared by allowing halo compounds CoX(CO) 2L 2 (X = Cl, I) to react with GeCl 2·dioxane. Treatment of trihalostannyl complexes Co(SnCl 2X)(CO) 2L 2 (1, 2) (X = Cl, I) with NaBH 4 in ethanol yielded tin trihydrido derivatives Co(SnH 3)(CO) 2L 2 (5, 6). Instead, reaction of Co(SnCl 2X)(CO) 2[PPh(OEt) 2] 2 (2) with LiAlH 4 in THF yielded the hydrido CoH(CO) 2[PPh(OEt) 2] 2 (7). Trimethylstannyl Co(SnMe 3)(CO) 2L 2 (8, 9) and trialkynylstannyl derivatives Co[Sn(C≡CPh) 3](CO) 2L 2 (10, 11) were prepared by allowing trihalostannyl compounds Co(SnCl 2X)(CO) 2L 2 (1, 2) to react with MgBrMe and with Li +(PhC≡C) -, respectively, in THF. The complexes were characterised by spectroscopy (IR and 1H, 31P, 13C, 119Sn NMR) and by X-ray crystal structure determination of Co(SnCl 2X)(CO) 2[PPh(OEt) 2] 2 (2) and Co(GeCl 3)(CO) 2[PPh(OEt) 2] 2 (4). © 2012 Elsevier B.V. All rights reserved
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