Two Cu(II) solvatomorphs with optically non-innocent ligand
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MELNIK, E., KRAVTSOV, Victor, LUCENTI, Elena, CARIATI, Elena, FONARI, Marina, FORNI, Alessandra. Two Cu(II) solvatomorphs with optically non-innocent ligand. In: Materials Science and Condensed Matter Physics, Ed. 9, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, Ediția 9, p. 113.
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Materials Science and Condensed Matter Physics
Ediția 9, 2018
Conferința "International Conference on Materials Science and Condensed Matter Physics"
9, Chișinău, Moldova, 25-28 septembrie 2018

Two Cu(II) solvatomorphs with optically non-innocent ligand


Pag. 113-113

Melnik E.1, Kravtsov Victor1, Lucenti Elena23, Cariati Elena34, Fonari Marina1, Forni Alessandra23
 
1 Institute of Applied Physics,
2 Institutul de Stiinţe şi Tehnologii Moleculară,
3 INSTM-UdR Milano,
4 University of Milan
 
Disponibil în IBN: 17 ianuarie 2019


Rezumat

The interest in functional coordination compounds is originated from their potential applications in material science associated with the properties of both the inorganic and organic components [1]. The triimidazole (triimidazo[1,2-a:1',2'-c:1'',2''-e][1,3,5]triazine) (L) and its isomeric by-product ([1,2-a:1',2'-c:1'',5''-e][1,3,5]triazine) (L1) display crystallization-induced emissive behavior associated with interchromophoric - interactions [2]. This key observation stimulated us to extend the investigation to different coordination compounds containing these optically active ligands. In this context, two novel solvatomorphs, namely the blue-grey [Cu(L1)4(NO3)2]CH3CN (1) and the greenish [Cu(L1)4(NO3)2] dmf (2) have been obtained by reaction of copper(II) nitrate trihydrate with L1. Crystals of the compounds are monoclinic with the unit cell dimensions for 1: P21/n, a=14.8001(7), b=9.0020(5), c=16.9972(12) Å, β=92.205(5)°, V=2262.9(2) Å3; for 2: P21/c, a=11.5519(4), b=22.6083(7), c=9.0408(4) Å, β=99.884(4)°, V=2326.1(1) Å3. The Cu(II) atom in centrosymmetric complexes 1 and 2 has the identical N4O2 square-bipyramidal coordination cores provided by four L1 ligands in basal plane and two NO3- anions in axial positions. The Cu-N and Cu-O distances are in the ranges 1.999-2.061 Å and 2.407-2.426 Å. The structures vary by the orientation of the L1 ligands relative to the basal planes and packing motifs due to accommodation of different solvents. Stacking between imidazole rings of L1 ligands is the dominant intermolecular interaction that unites complexes in 3D patterns (Figure): the centroid•••centroid distances being in the range 3.511-3.735 Å for 1 and 3.316-3.423 Å for 2. The presence of stacking motifs in the reported coordination compounds responsible for the emission of free ligands [2] is a promising event for the ongoing research in the field of emissive coordination compounds.