The trimorphic structure of N,N `-bis(5-methylsalicylidene)-4-methyl-1,3-phenylenediamine
PBN-AR
Instytucja
Wydział Chemii (Uniwersytet im. Adama Mickiewicza w Poznaniu)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE
ISSN
0108-7681
EISSN
1600-5740
Wydawca
WILEY-BLACKWELL
DOI
URL
Rok publikacji
2014
Numer zeszytu
5
Strony od-do
792-800
Numer tomu
70
Identyfikator DOI
Liczba arkuszy
Autorzy
(liczba autorów: 2)
Streszczenia
Język
en
Treść
The new Schiff base ligand, N,N'-bis(5-methylsalicylidene)-4methyl-1,3-phenylenediamine (H2L), has been prepared by condensation of 5-methylsalicylaldehyde with 4-methyl-1,3-phenylenediamine. It was found that this ligand crystallizes in the monoclinic space group P2(1)/c, with Z' = 1. Further studies showed that - as a result of the one-pot metal-promoted reactions - three different polymorphic forms of H2L were obtained, with different numbers (1, 3 or 4) of symmetry-independent molecules depending on the lanthanide metal ion present in the reaction media: La (Z' = 3), Nd (Z' = 4), Sm, Tb, Ho and Yb (all Z' = 1); the last form is identical with that obtained by crystallization of the ligand itself. The geometrical features of all eight independent molecules of H2L are very similar. The relatively strong intramolecular O-H center dot center dot center dot N hydrogen bonds stabilize almost co-planar conformations of terminal rings and C-C=N-C linkers, at the same time strong hydrogen-bond donors and acceptors involved in these interactions cannot take part in the determination of supramolecular architecture. Therefore, weak intermolecular interactions are important and this can be regarded as one of the reasons for packing conflicts that lead to the presence of polymorphic forms and multiple molecules. The pseudosymmetries are observed in both forms with Z' > 1 and the degree of pseudosymmetry is described by the values of appropriate combinations of the coordinates. In order to elucidate the differences in crystal structures the Hirshfeld surface method was applied. It shows that there are only small differences in the surface shape and in the fingerprint plots; however, the volumes of voids in three structures are significantly different.
Cechy publikacji
discipline:Biochemia – dziedzina nauk chemicznych
discipline:Chemia
discipline:Technologia chemiczna – dziedzina nauk chemicznych
discipline:Biochemistry – field of chemical sciences
discipline:Chemistry
discipline:Chemical Technology – field of chemical sciences
Original article
Original article presents the results of original research or experiment.
Oryginalny artykuł naukowy
Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu.
Inne
System-identifier
PBN-R:763876
CrossrefMetadata from Crossref logo
Cytowania
Liczba prac cytujących tę pracę
Brak danych
Referencje
Liczba prac cytowanych przez tę pracę
Brak danych