title: 30 space-group corrections: two examples of false polymorphism and one of incorrect interpretation of the fine details of an IR spectrum.
abstract: Revised structures are reported for 30 crystalline compounds, based on space groups of higher symmetry than originally reported. In 18 cases the Laue class is revised, in seven cases the center of symmetry is added, in two cases the Laue class change is coupled with the addition of the center of symmetry, in two cases the addition of the center of symmetry also requires the addition of systematic absences and, finally, one case of the addition of systematic absences without changing the Laue group is reported. Two examples (CSD refcodes: DAMLIM and ABPZCU01) of false polymorphism and one (PAVJUR) of the erroneous interpretation of the fine details of IR spectra, owing to incorrect space-group determination, have been detected.
authors.affiliation: Dipartimento di Ingegneria dei Materiali e di Chimica Applicata, Università di Trieste, Sede di Pordenone, Via Prasecco 3/A, 33170 Pordenone, Italy. clemente@units.it
authors.forename: Dore Augusto
authors.initials: DA
authors.lastname: Clemente
authors.forename: Armando
authors.initials: A
authors.lastname: Marzotto
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D018360:Crystallography, X-Ray; D016208:Databases, Factual; D008968:Molecular Conformation; D009930:Organic Chemicals / Q000737:chemistry*; D013055:Spectrophotometry, Infrared
chemical_list: D009930:Organic Chemicals