Far Infrared Spectra of CHaHgBr, CH3Hgl, CD3HgB:r and CD3Hgl

Far infrared spectra of the molecules CH3HgBr, CH3Hgl, CDaHgBr and CD3Hgl in the range 350-59 cm-1 are presented. The results include vibrational frequencies of Hg-Hal stretching (v4) and C-Hg-Hal bending (v8) modes. The band shapes are consistent with shapes of other fundamental bands of methyl mercuric halides

An Infrared Cell for Kinetic Studies of Liquid Samples

The construction ,of a th ermostated liquid infrared cell for the temperature range from -1ooc to gooc is described. \u27The cell is designed specifically for the P erkin-Elmer 21 series of double beam infrared spectrophotometers (Perkin-Elmer 21, 221 , 421 and 521), and can be conveniently used for kinetic studies

Hybridization in 1,3,5-Cycloheptatriene and Some Related Molecules by the Method of Maximum Overlap

The hybridization in 1,3,5-cycloheptatriene, 1,3,5,7-cyclooctatetraene, 1,3-cyclohexadiene, and 1,4-cyclohexadiene has been calculated by the method of maximum overlap. The results show that if the molecules are assumed to be planar, hybrids describing the molecular skeleton deviate from the line joining the neighbouring carbon atoms and are directed towards the ins.ide of the ring. The deviation angles for the above molecules vary between 1.25° and 7 .5°. For non-planar structures the deviation angles are decreased or are equal to zero. The puckering of the molecular skeleton thus considerably reduces the strain

Reaction of Aryldiazonium Chlorides with 1,3,5-Triketones. An Evidence for the Azohydrazone Conversion

The coupling reactions of diazonium chlorides with sym- 1,3,5-triketones are described. The azo-form of the products · is rearranged .into .the hydrazo-form during this reaction. Dihydrazones (I) were formed in the sodiumacetate buffered so1ution while in the sodium hydroxide solution both (I) and monohydrazones (II) were formed. The spectroscopic analysis, based on the data from infrared and ultraviolet spectra, indicates that dihydrazones exist in the double syn-form with an intramolecular hydrogen bond

Vibrational Spectra and Force Constants of Bicyclic Molecules. I. Norbornane and Norbornane-d4

Norbornan.e (bicyclo[2.2.l]heptane) and its derivatives have been extensively studied by chemical and physical methods. Since norbornane represents an important strained molecule, particular attention was payed tci its geometry1 and bonding properties2• However, no vibrational analysis of norbornane or its derivatives has been undertaiken. Only partly analysed vibrational spectra are reported3• Therefore we find des~rable to undertake a complete vibrational analysis of norbornane and its deuterated species

Far Infrared Spectra of CHaHgBr, CH3Hgl, CD3HgB:r and CD3Hgl

Far infrared spectra of the molecules CH3HgBr, CH3Hgl, CDaHgBr and CD3Hgl in the range 350-59 cm-1 are presented. The results include vibrational frequencies of Hg-Hal stretching (v4) and C-Hg-Hal bending (v8) modes. The band shapes are consistent with shapes of other fundamental bands of methyl mercuric halides

An X-ray and Proton Magnetic Resonance Study of the Dehydration and Deuteration of Borax, Na2[B40s(OH)4] · 8 H20

A quantitative powder-x-ray analysis was developed for this case by which it was shown that carefully prepared borax dehydrates directly into an unhydrous amorphous phase. Eight molecul es of water are quantitatively lost on complete dehydration (below 50°C) as required by the structural formula.. The proton m agnetic resonance results agree with these findings showing also that the spectrum due to OH-groups changes considerably on dehydration. This was used ~n following deuteration (solid/gas) of dehydrated borax. The p.m.r. spectra, the x-ray di agrams, and the measured regain indicate ·a reconshltution of the borax- lattice towards the formula Na2,[B 40 5(0H) 4] • 8D 20

Reaction of Aryldiazonium Chlorides with 1,3,5-Triketones. An Evidence for the Azohydrazone Conversion

The coupling reactions of diazonium chlorides with sym- 1,3,5-triketones are described. The azo-form of the products · is rearranged .into .the hydrazo-form during this reaction. Dihydrazones (I) were formed in the sodiumacetate buffered so1ution while in the sodium hydroxide solution both (I) and monohydrazones (II) were formed. The spectroscopic analysis, based on the data from infrared and ultraviolet spectra, indicates that dihydrazones exist in the double syn-form with an intramolecular hydrogen bond

Hybridization in 1,3,5-Cycloheptatriene and Some Related Molecules by the Method of Maximum Overlap

The hybridization in 1,3,5-cycloheptatriene, 1,3,5,7-cyclooctatetraene, 1,3-cyclohexadiene, and 1,4-cyclohexadiene has been calculated by the method of maximum overlap. The results show that if the molecules are assumed to be planar, hybrids describing the molecular skeleton deviate from the line joining the neighbouring carbon atoms and are directed towards the ins.ide of the ring. The deviation angles for the above molecules vary between 1.25° and 7 .5°. For non-planar structures the deviation angles are decreased or are equal to zero. The puckering of the molecular skeleton thus considerably reduces the strain