Michael T. Hay

Synthesis and characterization of a novel iron (III) silsesquioxane compound

Abstract A new iron (III) containing silsesquioxane compound, [Bu4N][((CH3)2CHCH2)7Si7O12FeCl] (4) was prepared by reacting [Bu4N][FeCl4] (3) with the isobutyl substituted silsesquioxane trisilanol, ((CH3)2CHCH2)7Si7O12H3, (1) in the presence of three equivalents of triethylamine, Et3N (2). The magnetic susceptibility of 4 was measured by Evans method, and the effective magnetic moment, μeff, is consistent with a high spin Fe (III) center. The composition and molecular structure of 4 was fully determined by IR, elemental analysis, APCI mass spec, and X-ray crystal analyses, and its potential as a precursor to a model of the structure and chemistry of the Fe-ZSM-5 catalyst is discussed.

New Fe(III) and Os(VI) silsesquioxanes

Abstract The high-spin iron(III) silsesquioxane complexes [N( n Bu) 4 ][( cyclo -C 5 H 9 ) 7 Si 7 O 12 FeCl] and [N( n Bu) 4 ][( cyclo -C 5 H 9 ) 7 Si 7 O 12 Fe(OSiMe 3 )] result from the reaction of ( cyclo -C 5 H 9 ) 7 Si 7 O 9 (OH) 3 with either [N( n Bu) 4 ][FeCl 4 ] or [N( n Bu) 4 ][Fe(OSiMe 3 ) 4 ]. Substitution of the terminal chloride or (trimethyl)silanolate ligands with tert -butoxide produces [N( n Bu) 4 ][( cyclo -C 5 H 9 ) 7 Si 7 O 12 Fe(OCMe 3 )]. Similar substitution reactions with the methyl ester of N -acetylcysteine produce [N( n Bu) 4 ][( cyclo -C 5 H 9 ) 7 Si 7 O 12 Fe{SCH 2 CH(NHCOCH 3 )CO 2 Me}]. A dimeric complex, [( cyclo -C 5 H 9 ) 7 Si 7 O 12 Fe(NEt 3 )] 2 , forms in the reaction of ( cyclo -C 5 H 9 ) 7 Si 7 O 9 (OH) 3 with NEt 3 and FeCl 3 . The reaction between ( cyclo -C 5 H 9 ) 7 Si 7 O 9 (OH) 2 (OSiMe 3 ) and [Ph 4 P][Os(N)Cl 4 ] forms [PPh 4 ][( cyclo -C 5 H 9 ) 7 Si 7 O 11 (OSiMe 3 )Os(N)Cl 2 ], a square-pyramidal Os(VI) complex with a bidentate siloxy ligand.

Tetrabutyl­ammonium tetrachloro­ferrate(III)

In the title compound, [(C4H9)4N][FeCl4], the central FeIII atom in the anion is tetrahedrally coordinated by four Cl atoms, while the cation exists as a central N atom bonded to four n-butyl groups, also in a tetrahedral arrangement. Both the cation and anion lie on crystallographic twofold axes.

Analytical Methods for Pesticide Residues in the Water Environment.

A review of literature published in 2014 focusing on analytical methods for pesticides in the water environment is presented here. The review includes publications on extraction methods and on analytical methods such as biochemical assays and immunoassays, electrochemical methods, chromatographic or mass spectrometric techniques, spectrophotometric techniques, fluorescence, and chemiluminescence techniques.

Tetra-butyl-ammonium tetra-kis-(trimethyl-silanolato-κO)ferrate(III).

In the title salt, (C16H36N)[Fe(C3H9OSi)4], the cation contains a central N atom bonded to four n-butyl alkyl groups in a tetrahedral arrangement, while the anion contains a central FeIII atom tetrahedrally coordinated by four trimethylsilanolate ligands.