Fused s-Triazino heterocycles. VI. 1,9,9b-Triazaphenalenes

Derivatives of 1,9,b-triazaphenalene have been prepared by reacting alkyl-N-cyanoimidates with 2,6-bis(cyanomethyl)pyridine.     

Conformational polymorphism in a chiral spiro-cis-ansa-bridged cyclo­triphosphazene derivative

The reaction of spermidine with 2,2,4,4-tetra­chloro-6,6-di­phenyl­cyclo­triphosphazene produces a mixture of products of which one of the fractions is a spiro-cis-ansa deriv­ative, namely 12-chloro-14,14-di­phenyl-2,6,11,13,15,16-hexa­aza-1,12-di­phosphatri­cyclo­[10.3.1.0^1,6]­hexadeca-12,14-diene, C₁₉H₂₆Cl­N₆P₃. Recrystallization of this fraction from different solvents results in the formation of two different crystalline forms. The rod morphology formed in di­chloro­methane–n-hexane (1:1) produces a triclinic structure with three mol­ecules in the asymmetric unit. These three mol­ecules adopt different conformations as a result of two NH groups flipping in an ansa-bridged ring system. The plate morphology crystals, grown in di­chloro­methane–n-hexane–ethyl acetate (1:1:1), produce a C-centred monoclinic structure that adopts a conformation that is essentially the same as one of the forms in the triclinic structure.     

Deuteration of cycloalkynes

When treated with the lithium salt of 1,3-diaminopropane, triple bonds in cyclic alkynes undergo multiple degenerate rearrangements. By employing the N,N,N′,N′-d₄, reagent, the course of the isomerization is followed as the triple bond circumnavigates the ring. Cycloalkynes are readily perdeuterated with this novel methodology.     

Simultaneous determination of the ground level abundances of N2O,CO2, CO and H2O

The AFCRL atmospheric line-parameter listing has been used with a non-linear, least-squares method of analysis to obtain the abundances of N₂O and CO in a sample of ground level air with a precision of about 1%. Absorption coefficients calculated for N₂O agree satisfactory with laboratory measurements but an error of 0.0267 cm^-1 in the listed position of an H₂O line at 2205.250 cm^-1 has been corrected and errors in the positions and intensities of CO₂ lines between 2230 and 2250 cm^-1 have been observed.     

Intensities and widths of H2O lines between 1800 and 2100 cm-1

A non-linear, least-squares program was used to obtain the line intensities and widths of 91 air-broadened lines in the ν₂ rotation-vibration band of water vapor in the region from 1800 to 2100 cm^-1. The values obtained for the line intensities are, on the average, about 7% stronger than the Air Force Cambridge Research Laboratories (AFCRL) Atmospheric Absorption Line Parameters Compilation. The experimental values for the half widths of the H₂O lines are, on the average, 4% higher than the calculated AFCRL values. The measurements have confirmed the narrow widths of some high J transition lines measured by tunable diode laser spectroscopy.