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http://nopr.niscpr.res.in/handle/123456789/18063| Title: | Synthesis, structure and luminescence behaviour of complexes of type [Cd(dpa)2X2] (dpa = 2,2'-djpyridylamine; X = N3-, NCS-, NCO-) |
| Authors: | Chowdhury, Habibar Ghosh, Rajarshi Rahaman, Sk Hafijur Rosair, Georgina M Ghosh, Barindra K |
| Issue Date: | Apr-2005 |
| Publisher: | NISCAIR-CSIR, India |
| IPC Code: | Int Cl.7 C07F3/08 ; C09K11/08 |
| Abstract: | The synthetic details and characterization data of three mononuclear complexes or the type [Cd(dpa)2X2] (dpa = 2,2'-dipyridylamine; X = N3-, NCS-, 2 and X-NCO-,3) are described. In one case, [Cd(dpa)2(NCS)2 (2), X-ray structure determination has been made for the exact definition of the coordination sphere. Structural analysis reveals that the cadmium(II ) centre is in a distorted octahedral environment with a CdN5S chromophore with two dpa units roughly perpendicular to one another and the two thiocyanates in mutual cis orientation with one in S-bound and the other in N-bound states. The mononuclear unit packs through N-H ... S and N-H- ... N hydrogen bonding to have a one-dimensional (ID) chain. Spectroscopic and other physicochemieal data show that compounds 1 and 3 have the cognate structure. The compounds display high energy intraligand 1(π- π *) fluorescence and intraligand 3(π- π *') phosphorcscence in glassy solutions (DMF at 77 K). A band (near 375 nm) observed for all the complexes in their solid state emission spectra is an excimeric emission. The role of dpa, a tailored diimine with active amine hydrogen and aromatic pyridine ring, is discussed towards functionalisation on crystal engineering and luminescence behaviour. |
| Page(s): | 687-692 |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Appears in Collections: | IJC-A Vol.44A(04) [April 2005] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCA 44A(4) 687-692.pdf | 1.33 MB | Adobe PDF | View/Open |
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