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Transition metal ions; imine ligand; crystal structure; fluorescence.

Synthesis and X-ray structural characterization of three complexes of type cis-[M(dafone)₂(NCS)₂] (M = Co(II), 1; Ni(II), 2; Zn(II), 3; dafone = 4,5-diazafluoren-9-one) and a polymer cis-[Cd(dafone)(NCS)₂]$_n$ (4) have been reported. Each of the four complexes is crystallized in orthorhombic crystal system. Structural study reveals that each metal(II) centre in the four complexes adopts distorted octahedral geometry with MN₆ chromophore in 1-3 and MN₄S₂ chromophore in 4. The room temperature steady-state fluorescent intensity of dafone in dimethyl formamide at 402 nm is found to be quenched in these reported dafone complexes (1-4).

Abhijit Pal¹ Bhaskar Biswas^{1 2} Merry Mitra¹ Chandra Shekhar Purohit³ Chia-Her Lind⁴ Rajarshi Ghosh¹

1. Department of Chemistry, The University of Burdwan, Burdwan 713 104, India
2. Department of Chemistry, Raghunathpur College, Purulia 723 133, India
3. Department of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar 751 005, India
4. Department of Chemistry, Chung Yuan Christian University, Chung Li 32023, Taiwan, Republic of China

Published

May 2014

Manuscript received

25 September 2013

Manuscript revised

20 January 2014

Accepted

27 January 2014

• supp18.doc