Synthesis and characterization of some tin(II) and tin(IV) derivatives of 4-acyl-5-pyrazolones. Crystal structure of bis(1-phenyl-3-methyl-4-acetyl-pyrazolon-5-ato)tin(II)

Add time:08/03/2019    Source:sciencedirect.com

Stable, four-coordinated (Q)2Sn compounds have been prepared, where QH is 1-phenyl-3-methyl-4-RC(O)-pyrazol-5-one (R = CH3, CF3, n-C6H13, C6H5,pF-C6H4,p-Cl-C6H4,p-Br-C6H4,p-I-C6H4,p-NO2-C6H4,p-CH3O-C6H4). They have been characterized through analytical data, IR and1H,13C and119Sn NMR spectroscopy. In the crystal structure of the title compound (8), the tin atom is found in a distorted ψ trigonal bipyramidal environment, with the tin lone pair occupying an equatorial site. The diaxial angle OSnO is bent [149.8(2)°] and two sets of SnO distances are found [SnO(1) = 2.141 (5)A˚; SnO(3) = 2.133 (5)A˚; SnO(2) = 2.296 (6)A˚; SnO(4) = 2.313 (6)A˚]. Oxidative addition of iodomethane or dihalogens (Br2 or I2) to (Q)2Sn provides a route to new (Q)2RnSnIVX2-n compounds (where X = Br or I;R = CH3 or X).

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