Influence of para substituents in controlling photophysical behavior and different non-covalent weak interactions in zinc complexes of a phenol based "end-off" compartmental ligand. Issue 46 (3rd November 2015)

• Record Type: Journal Article
• Authors: Chakraborty, Prateeti; Adhikary, Jaydeep; Samanta, Sugata; Majumder, Ishani; Massera, Chiara; Escudero, Daniel; Ghosh, Sanjib; Bauza, Antonio; Frontera, Antonio; Das, Debasis
• Is Part Of: Dalton transactions. Volume 44:Issue 46(2015)
• Page Start: 20032
• Page End: 20044
• Publication Date: 2015-11-03
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c5dt02768c
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : The role of para substituents of three dinuclear zinc(ii ) complexes on the structure, photophysical properties and their different weak interactions is investigated. Abstract : Three dinuclear zinc(ii ) complexes with "end-off" compartmental ligands, namely 2, 6-bis( N -ethylmorpholine-iminomethyl)-4-R-phenol (R = –CH3, Cl, t Bu) have been synthesized with the aim of exploring the role of the para substituent present in the ligand backbone in controlling the structural diversity, photophysical properties and different weak interactions of the complexes. All three species, with the general formula {2[Zn2 L(CH3 COO)2 ][Zn(NCS)4 ]}, show the complex anion Zn(NCS)4 2− as a common structural feature decisive for crystallization. Interestingly, all of them possess several non-covalent weak interactions where the nature of the "R" group plays an essential role as exposed by DFT study. Besides exhibiting fluorescence behavior, the complexes also show para substitution controlled phosphorescence both at room and low temperature. Anisotropy studies suggest the existence of complexes2 and3 as dimers in solution. The origins of the unusual room temperature phosphorescence and fluorescence behavior of the complexes have been rationalized in the light of theoretical calculations.