106564-58-3Relevant academic research and scientific papers
IR-active organometallic pH probes
Anson, Christopher E.,Baldwin, Tina J.,Creaser, Colin S.,Fey, Mark A.,Stephenson, G. Richard
, p. 1451 - 1456 (1996)
Tricarbonylmetal π-complexes of unsaturated organic ligands containing CO2H, OH, and NH2 substituents are used as FTIR-readable molecular probes of solution pH. Wavenumber shifts in the νsym(CO) and νasym(CO) bands in the FTIR spectra of the complexes [(η4-CH3-CH=CHCH=CHCO2H)Fe(CO) 3], [(η4-CH3CH=CHCH=CHCO2H)Fe(CO) 2(PPh3)], [(η6-C6H5-CO2H)Cr(CO)z 3], [(η6o-C6H4(CO2H) 2)Cr(CO)3], [η6-C6H5NH2)Cr(CO)3], [(η6-p-CH3C6H4OH)-Cr(CO) 3], and [(η6-p-CH3O2CC6H 4OH)Cr(CO)3], resulting from deprotonation or protonation of the complexes, can be correlated with the pH of the solution, enabling straightforward spectroscopic readout of pH. It is shown that, by appropriate choice of pH-sensitive functional group, a complex can be selected to respond over a particular pH range and that the pH response can be fine-tuned by the presence of other substituents on the organic unit. The narrow bandwidths of the ν(CO) vibrational modes allow the simultaneous use of more than one such complex in a solution. This approach, which we term the use of dual-sensor systems, has several advantages over single sensors, and its potential in the analysis of multianalyte systems is described.
Synthesis, electrochemical behavior and X-ray crystal and molecular structures of [Fe(diene)(CO)2PPh3] (diene = chalcone, sorbic acid)
Zutin,Nogueira,Mauro,Melnikov,Iluykhin
, p. 1011 - 1016 (2008/10/08)
The compounds [Fe(ch)(CO)2PPh3] (1) (ch = chalcone) and [Fe(sba)(CO)2PPh3] (2) (sba = sorbic acid) were prepared by irradiating the tetracarbonyltriphenylphosphineiron(0) complex in benzene in the presence of ch or sba. The compounds were characterized by infrared and 31P NMR spectroscopies. Their electrochemical behavior was investigated by cyclic voltammetry and the results suggest that their oxidations occur by more than one electrochemical step, producing free ch and sba, free PPh3 and solvated Fe(III). It was observed that sba ligand contributes more effectively to the stabilization of metal center in these complexes. The X-ray crystal and molecular structures of 1 and 2 were determined; it was shown that the Fe atom adopts a distorted octahedral coordinated geometry in which three of the sites are occupied by the ch or sba ligand. The [Fe(ch)(CO)2PPh3] complex is a monomer and the unit cell of complex 2 contains exist two identical and crystallographically independent molecules of [Fe(sba)(CO)2PPh3] which are linked by short hydrogen bonds O-H···O.
(Sorbic acid)Fe(CO)2L complexes with L=CO, P(OPh)3, PPh3, and PEt3. Photolytic preparation, spectral properties, and bonding
Santos, Elvio H.,Stein, Edison,Vichi, Eduardo J. S.,Saitovitch, Elisa B.
, p. 197 - 202 (2007/10/02)
The (sorbic acid)Fe(CO)2L complexes, with L=CO, P(OPh)3, PPh3 and PEt3, have been prepared by irradiating the corresponding Fe(CO)4L compounds in benzene in the presence of sorbic acid.The Moessbauer spectra are compatible with the structure of a tetragon
