Examination of the effect of crystal packing forces on geometric parameters: a combined crystallographic and theoretical study of 2,2'-bipyridyl adducts of R2SnCl2
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Edward R. T. Tiekink
Crystal structure determinations on a series of R2SnCl2(bipy)[bipy is 2,2'-bipyridyl] compounds show that these adopt a common structural motif in the solid-state with the Sn-bound organic substituents occupying mutually trans positions in a distorted octahedral geometry. A comparison of the experimental Sn–Cl and Sn–N bond distances with the moderated (i.e. by changing the nature of R) Lewis acidities of the tin atoms shows a general correlation, i.e. longer distances with decreasing Lewis acidity, but with a relatively large spread of values. In order to examine the role of crystal packing effects on the derived geometric parameters, gas-phase structures for these compounds have been modeled employing ab initio molecular orbital theory. These calculations showed that within individual compounds the two Sn–Cl distances are equal as are the two Sn–N distances, in contrast to the solid-state results. Further, a better correlation between the Sn–Cl and Sn–N bond distances and the Lewis acidity of the tin atom was found. These key results are attributed to the influence of crystal packing forces on the geometric parameters about the tin center in the solid-state.
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Artikel in diesem Heft
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- The crystal structure of synthetic buckhornite, [Pb2BiS3][AuTe2]
- Experimental and theoretical high pressure study of β-Cs2SO4
- Examination of the effect of crystal packing forces on geometric parameters: a combined crystallographic and theoretical study of 2,2'-bipyridyl adducts of R2SnCl2
- Crystal structure of new Ni(II) complex with non-symmetrical bis-enaminone from powder diffraction data
- 1,1´,3,3´-Tetramethyl-2,2´-diimidazolium dication: Its bromide salt and the tetraphenylborates of its ketone adducts
- Crystal structure of picropodophyllin
- Crystal structure of 7-acetyl-5-benzoyl-6-phenyl-8-methyl-4,7-dihydropyrazolo[1,5-c]-1 H-pyrimidine-2-one
- Crystal structures and DSC investigations of trimethylphenylammonium perchlorate, trimethyl-phenylammonium tetrafluoroborate, methyltriphenyl-phosphonium perchlorate, and methyltriphenyl-phosphonium tetrafluoroborate, [Me3PhN][ClO4], [Me3PhN][BF4], [MePh3P][ClO4], and [MePh3P][BF4]
- Bond-valence approach to the copper-copper and copper-oxygen bonding in binuclear copper(II) complexes: Structure of tetrakis(2-fluoro-benzoato-O,O´)-bis(2-fluorobenzoate-O) dicopper(II)
- Structure and vibrational spectra of cis-diaquatetra-chloroplatinum(IV)-(18-crown-6)-water (1/1/2), cis-[PtCl4(H2O)2]·(18-cr-6)·2H2O
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- Books Received
