1,3-Dimethyl-5-Iminotetrazole, a New Cyclic “Meso-Ionic” Compound

The Raman Spectrum and Thermodynamic Properties of Iron Pentacarbonyl

“…Sheline and Pitzer have assigned the infrared frequencies observed above 450 cm.-1 but did not determine the frequencies of the Fe-C bending or all of the CO bending modes. 2 We have reviewed their infrared assignment and with one minor exception have found it to be consistent with our Raman studies. In addition we have been able to make a reasonable estimate of the low frequency, infrared active Fe-C bending modes from information obtained from the Raman spectrum of iron pentacarbonyl along with related spectral data from the Ni(CO)4, Cr(CO)e and Mo-(CO), compounds.2'3•6…”

“…A considerable number of structural and spectroscopic studies of the transition metal carbonyls have been made in order to obtain a better understanding of the type of bonding involved. [1][2][3][4][5][6][7] (1) For reviews of the metal carbonyls see: J. S. Anderson, Quart. Rev., 1, 331 (1947); A.…”

The molecular configuration of 1,4-dimethyl-5-imino-tetrazole

“…Accordingly, crystals of the hydrochloride and hydrobromide salts of this compound (Henry, Finnegan & Lieber, 1954) were examined, and a partial structure analysis of the hydrobromide salt was made. As no further work on these compounds is planned, the results obtained are reported here.…”

Mesoionic tetrazolium-5-aminides: Synthesis, molecular and crystal structures, UV–vis spectra, and DFT calculations

“…The most interesting and less examined 5-aminotetrazole derivatives are tetrazolium-5-aminides, which can be depicted as 4 by analogy with other mesoionic tetrazoles [11,12]. The first representatives of tetrazole-5-aminides were reported in the 1950s [13,14], whereas next publications were appeared only five decades later, being devoted to the synthesis and photochemistry of 1,3-diaryltetrazolium-5-aminides [15][16][17][18][19][20][21]. NMR studies of a few tetrazole-5-aminides were carried out as a part of studies of mesoionic compounds [22][23][24].…”