02442nas a2200277   4500008004100000022001400041245010600055210006900161260010600230300001200336490000800348520141600356653003001772653001701802653001401819653001601833653002201849100002401871700003001895700001701925700002901942700002101971700002001992700002402012856012802036       2016                        eng d  a0277-538700aPhotoluminescent tetrahedral d(10)-metal Schiff base complexes exhibiting highly ordered mesomorphism0 aPhotoluminescent tetrahedral d10metal Schiff base complexes exhi  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcFEB  a150-1580 v1053 a<p>A series of four-coordinate d(10)-metal complexes of the type [ML2] {M = Zn, Cd, Hg; L = 4-nitro-2-((octadecylimino)methyl)phenol}, incorporating a new N-alkylated bidentate [N,O]-donor salicylaldimine Schiff base ligand, has been synthesized and characterized by elemental analyses, FT-IR, UV-Vis, H-1 NMR and FAB-mass spectroscopies. The ligand is non-mesomorphic and devoid of any photoluminescence. The zinc(II) and cadmium(II) complexes displayed highly ordered mesophases reminiscent of soft crystals. The phases have been characterized by polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and powder X-ray diffraction (PXRD) studies. The complex of mercury(II) decomposed prior to melting. An orthogonal symmetry with a `herringbone' array for the zinc complex and a primitive triclinic symmetry (p(1)) for the cadmium complex, respectively, has been proposed. The complexes exhibited fluorescence at room temperature, both in the solution and in the solid state, with emission maxima in the blue region. Density functional theory (DFT) calculations carried out using the GAUSSIAN 09 program at the B3LYP level revealed a distorted tetrahedral geometry around the metal center in all the complexes. Natural bond orbital (NBO) analysis suggested appreciable charge transfer from the ligand to the metal center in the complexes. (C) 2015 Elsevier Ltd. All rights reserved.</p>10aDensity functional theory10aLuminescence10aMesophase10aSchiff base10aX-ray diffraction1 aChakraborty, Sutapa1 aPurkayastha, Debraj, Dhar1 aDas, Gobinda1 aBhattacharjee, Chira, R.1 aMondal, Paritosh1 aPrasad, Krishna1 aRao, D., S. Shankar  uhttps://library.ncl.res.in/content/photoluminescent-tetrahedral-d10-metal-schiff-base-complexes-exhibiting-highly-ordered-1