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Three zinc(II) and cadmium(II) complexes containing 4‐amino‐3,5‐bis(pyridin‐2‐yl)‐1,2,4‐triazole and polynitrile ligands: synthesis, molecular and supramolecular structures, and photoluminescence properties
Author(s) -
Setifi Zouaoui,
Zambon Daniel,
Setifi Fatima,
El-Ghozzi Malika,
Mahiou Rachid,
Glidewell Christopher
Publication year - 2017
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229617011391
Subject(s) - chemistry , zinc , stacking , hydrogen bond , supramolecular chemistry , crystallography , ligand (biochemistry) , triazole , 1,2,4 triazole , stereochemistry , cadmium , photoluminescence , crystal structure , metal , molecule , medicinal chemistry , materials science , organic chemistry , biochemistry , receptor , optoelectronics
Three photoluminescent complexes containing either Zn II or Cd II have been synthesized and their structures determined. Bis[4‐amino‐3,5‐bis(pyridin‐2‐yl)‐1,2,4‐triazole‐κ 2 N 1 , N 5 ]bis(dicyanamido‐κ N 1 )zinc(II), [Zn(C 12 H 10 N 6 ) 2 (C 2 N 3 ) 2 ], (I), bis[4‐amino‐3,5‐bis(pyridin‐2‐yl)‐1,2,4‐triazole‐κ 2 N 1 , N 5 ]bis(dicyanamido‐κ N 1 )cadmium(II), [Cd(C 12 H 10 N 6 ) 2 (C 2 N 3 ) 2 ], (II), and bis[4‐amino‐3,5‐bis(pyridin‐2‐yl)‐1,2,4‐triazole‐κ 2 N 1 , N 5 ]bis(tricyanomethanido‐κ N 1 )cadmium(II), [Cd(C 12 H 10 N 6 ) 2 (C 4 N 3 ) 2 ], (III), all crystallize in the space group P , with the metal centres lying on centres of inversion, but neither analogues (I) and (II) nor Cd II complexes (II) and (III) are isomorphous. A combination of N—H…N and C—H…N hydrogen bonds and π–π stacking interactions generates three‐dimensional framework structures in (I) and (II), and a sheet structure in (III). The photoluminescence spectra of (I)–(III) indicate that the energies of the π–π* transitions in the coordinated triazole ligand are modified by minor changes of the ligand geometry associated with coordination to the metal centres.