作者: R D'Amato , A Furlani , M Colapietro , G Portalone , M Casalboni
DOI: 10.1016/S0022-328X(00)00791-9
关键词: Single crystal 、 Substituent 、 Molecule 、 Ligand 、 Crystallography 、 Space group 、 Crystal structure 、 Photoluminescence 、 Acetylide 、 Chemistry
摘要: Abstract Symmetric trans-[Pt(PPh3)2(CCR)2] and unsymmetrical trans-[Pt(PPh3)2Cl(CCR)], (R=C6H4–pNO2, C6H4–pOCH3), Pt(II) acetylides were prepared characterised, as well bis-acetylides, trans-[Pt(PPh3)2(CCR)(CCR′)], R′=C6H5; R=C6H4–pOCH3, R′=C6H4–pNO2; R=C6H4–pNO2, R′=[(η5-C5H4)Fe(η5-C5H5)]). Also symmetric Pd(II) trans-[Pd(PPh3)2(CCR)2] C6H5) synthesised characterised by IR, NMR, UV–vis spectroscopies. The optical properties of the new complexes compared within a series known containing different phosphines cis–trans configuration. absorption photoluminescence spectra indicate that emission is found in range 355–600 nm, depending on nature acetylide ligand bound to Pt. Measurements SHG for bis-acetylides dispersed polymethylmethacrylate (PMMA) show second-order nonlinear (NLO) depend strength donor–acceptor substituent ligand. Third-order NLO (in particular coefficient α2) measured Z-scan technique; strong push–push pull–pull substituents induce electronic delocalisation tuning properties. single crystal X-ray structure trans-[Pt(PPh3)2(CC–C6H5)(CC–C6H4NO2)] shows molecule crystallised Pbca centric space groups.