Pd II , Zn II and Ag I Complexes of Tetrakis( N ‐7‐azaindolyl)benzene: Variation of Bonding Modes, Extended Structures and Luminescence

• Published in: European journal of inorganic chemistry 2003-10, Vol.2003 (20), p.3774-3782
• Main Authors: Song, Datong, Wang, Suning
• Format: Article
• Language: English
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.200300249

Pd II , Ag I and Zn II complexes of tetrakis(7‐azaindolyl)benzene (ttab), [(PdCl 2 ) 2 (ttab)] ( 1 ), [(ZnCl 2 ) 2 (ttab)] ( 2 ), [Ag(NO 3 )] 2 (ttab) ( 3a ) and [Ag(NO 3 )(DMSO)] 2 (ttab) ( 3b ) were synthesized and fully characterized by NMR spectroscopy, single‐crystal X‐ray diffraction and elemental analyses. The ttab ligand in these complexes displays two different bonding modes. In the Pd II and Zn II complexes, the ttab ligand chelates to the metal center via two ortho 7‐azaindolyl groups (the ortho mode). In contrast, in the Ag I complex, it chelates to the Ag I ion via two meta 7‐azaindolyl groups (the meta mode). In the solid state, molecules of 1 and 2 form grid‐like extended structures that host solvent molecules such as DMSO and CH 2 Cl 2 . Compound 3a appears to be a coordination polymer and can be converted into compound 3b when dissolved in DMSO. A hydrogen bonded complex [Zn(O 2 CCF 3 ) 2 (H 2 O) 2 ](ttab) ( 4 ), which displays an unusual hydrogen bonded helical chain structure in the solid state, was also characterized. Except for compound 1 , these new compounds all emit blue light when irradiated by UV radiation. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)