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Luminescent Star‐Shaped Zinc(II) and Platinum(II) Complexes Based on Star‐Shaped 2,2′‐Dipyridylamino‐Derived Ligands
Author(s) -
Seward Corey,
Pang Jun,
Wang Suning
Publication year - 2002
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200206)2002:6<1390::aid-ejic1390>3.0.co;2-e
Subject(s) - chemistry , crystallography , ligand (biochemistry) , crystal structure , luminescence , benzene , platinum , metal , molecule , tris , triazine , zinc , stereochemistry , polymer chemistry , catalysis , organic chemistry , physics , optoelectronics , biochemistry , receptor
New Zn II and Pt II complexes of the star‐shaped ligands 2,4,6‐tris(2,2′‐dipyridylamino)‐1,3,5‐triazine (tdat), 1,3,5‐tris(2,2′‐dipyridylamino)benzene (tdab), 2,4,6‐tris[ p ‐(2,2′‐dipyridylamino)phenyl]‐1,3,5‐triazine (tdapt) and 1,3,5‐tris[ p ‐(2,2′‐dipyridylamino)phenyl]benzene (tdapb) have been synthesized and characterized. 1:1, 1:2 and 1:3 (ligand vs. the number of Zn atoms) Zn II complexes of the tdat ligand have been identified. The 1:1 and 1:2 Zn II complexes of tdat are dynamic in solution. For the tdab, tdapt and tdapb ligands, only 1:3 complexes of Pt II and Zn II have been isolated. Single‐crystal X‐ray diffraction analyses have been carried out for some of these new complexes, which revealed that there is a distinct difference in the arrangement of star‐shaped ligands in the complexes of Zn II and those of Pt II . The Pt II complexes of tdat and tdab adopt an unusual “bowl” shape and stack in a “head‐to‐tail” fashion in the crystal lattice. In contrast, the corresponding Zn II complexes do not have a “bowl” shape. The difference between the Zn II complexes and the Pt II complexes can be attributed to the different coordination geometry preferred by the two metal ions. The Zn II complex of tdapb displays several crystal motifs, two of which contain benzene molecules in the crystal lattices. All complexes are luminescent in the blue region, attributable to ligand‐based π ⇄ π* transitions. (© Wiley‐VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)