An non-centrosymmetric mononuclear Zr complex exhibiting UV second-harmonic-generation

2015 ◽  
Vol 08 (02) ◽  
pp. 1550029
Author(s):  
Cai-Yun Han ◽  
Mei Qu ◽  
Qin-Qin Dang ◽  
Xian-Ming Zhang
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Organic Ligand ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Strong Response ◽  
Oxygen Donor ◽  
Transmission Study

A novel non-centrosymmetric (NCS) orthorhombic complex Zr ( dmpu )2 Cl 4 (1) has been solvothermally prepared in situ from starting materials of Zirconium(IV) acetylacetonate ( Zr ( acac )4) and N,N-dimethylpropyleneurea (dmpu), in which dmpu can act not only as solvent but also as organic ligand of monodentate oxygen donor. The second-harmonic generation (SHG) measurements reveal that complex 1 has a strong response of 1.4 times that of potassium dihydrogen phosphate (KDP) at 532 nm based on the Kurtz–Perry method. Furthermore, optical transmission study indicates that complex 1 has a wide transparency range in the UV region (200–850 nm) with a cutoff at 291 nm. According to first-principles calculations, the enhanced macroscopic SHG response of 1 can be attributed to the organic ligand dmpu. Therefore, 1 could be a promising candidate for non-linear optical material.

scholarly journals Synthesis, Growth and Characterization of New Promising Organic Non-Linear Optical Crystal: L-Alanine Alaninium Nitrate

2019 ◽  
Vol 31 (8) ◽  
pp. 1661-1666
Author(s):  
G. Krishnamoorthi ◽  
R. Uvarani
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Visible Region ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Dielectric Study ◽  
Second Harmonic Generation Efficiency ◽  
Cell Parameters ◽  
Induced Defects

A relative study on pure L-alanine alaninium nitrate (LAAN) single crystals and doped with lanthanum oxide, urea and glycine were developed from fluid solution by slow evaporation strategy at room temperature. X-ray diffraction result reveals that LAAN crystallites with system with space bunch P21 and cell parameters a = 7.836 Å, b = 5.428 Å, c = 12.809 Å and β = 94.25°. These parameters were marginally changes for doped crystals compared to pure LAAN crystal. The UV results recommend that the great transmission property of the doped LAAN crystal within the whole visible region guarantees its reasonableness for second harmonic generation applications. The presence of dopants within the LAAN crystal was further affirmed through ICP studies. The functional groups were analyzed through Fourier change infrared spectra investigation. The microhardness and dielectric study at 100 Hz was found to be broadly higher than that of pristine LAAN. The AC conductivity was found to extend after doping due to the induced defects in crystal lattice. The grown crystals were also subjected to second harmonic generation efficiency tests and it was found to be La2O3 doped LAAN crystal is 2.8 times greater than that of potassium dihydrogen phosphate (KDP).

scholarly journals Characterization of salt interferences in second-harmonic generation detection of protein crystals

2013 ◽  
Vol 46 (6) ◽  
pp. 1903-1906 ◽  
Author(s):  
R. G. Closser ◽  
E. J. Gualtieri ◽  
J. A. Newman ◽  
G. J. Simpson
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Sparse Matrix ◽  
Second Harmonic ◽  
Protein Crystallization ◽  
Potassium Dihydrogen Phosphate ◽  
Protein Crystals ◽  
Dihydrogen Phosphate ◽  
Crystal Formation ◽  
Crystallization Experiments

Studies were undertaken to assess the merits and limitations of second-harmonic generation (SHG) for the selective detection of protein and polypeptide crystal formation, focusing on the potential for false positives from SHG-active salts present in crystallization media. The SHG activities of salts commonly used in protein crystallization were measured and quantitatively compared with reference samples. Out of 19 salts investigated, six produced significant background SHG and 15 of the 96 wells of a sparse-matrix screen produced SHG upon solvent evaporation. SHG-active salts include phosphates, hydrated sulfates, formates and tartrates, while chlorides, acetates and anhydrous sulfates resulted in no detectable SHG activity. The identified SHG-active salts produced a range of signal intensities spanning nearly three orders of magnitude. However, even the weakest SHG-active salt produced signals that were several orders of magnitude greater than those produced by typical protein crystals. In general, SHG-active salts were identifiable through characteristically strong SHG and negligible two-photon-excited ultraviolet fluorescence (TPE-UVF). Exceptions included trials containing either potassium dihydrogen phosphate or ammonium formate, which produced particularly strong SHG, but with residual weak TPE-UVF signals that could potentially complicate discrimination in crystallization experiments using these precipitants.

scholarly journals Second harmonic generation from the `centrosymmetric' crystals

IUCrJ ◽  
2015 ◽  
Vol 2 (3) ◽  
pp. 317-321 ◽  
Author(s):  
Venkatram Nalla ◽  
Raghavender Medishetty ◽  
Yue Wang ◽  
Zhaozhi Bai ◽  
Handong Sun ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Uv Light ◽  
Second Harmonic ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Potassium Dihydrogen ◽  
Space Group ◽  
Shg Efficiency ◽  
Optical Phenomena

Second harmonic generation (SHG) is a well known non-linear optical phenomena which can be observed only in non-centrosymmetric crystals due to non-zero hyperpolarizability. In the current work we observed SHG from a Zn(II) complex which was originally thought to have crystallized in the centrosymmetric space groupC2/c. This has been attributed to the unequal antiparallel packing of the metal complexes in the non-symmetric space groupCcor residual non-centrosymmetry inC2/cgiving rise to polarizability leading to strong SHG. The enhancement of SHG by UV light has been attributed to the increase in non-centrosymmetry and hence polarity of packing due to strain induced in the crystals. The SHG signals measured from these crystals were as large as potassium dihydrogen phosphate crystals, KH2PO4(KDP), and showed temperature dependence. The highest SHG efficiency was observed at 50 K. The SHG phenomenon was observed at broad wavelengths ranging from visible to below-red in these crystals.

scholarly journals An in situ study of reconstructed gold electrode surfaces by second harmonic generation

1989 ◽  
Vol 163 (2-3) ◽  
pp. 123-128 ◽  
Author(s):  
A. Friedrich ◽  
B. Pettinger ◽  
D.M. Kolb ◽  
G. Lüpke ◽  
R. Steinhoff ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Gold Electrode ◽  
Second Harmonic ◽  
Electrode Surfaces ◽  
In Situ Study

scholarly journals In situ second-harmonic generation mediated photodynamic therapy by micelles co-encapsulating coordination nanoparticle and photosensitizer

RSC Advances ◽  
2017 ◽  
Vol 7 (82) ◽  
pp. 52125-52132 ◽  
Author(s):  
Xuyang Zhou ◽  
Yang Chen ◽  
Jian Su ◽  
Xiaohe Tian ◽  
Yonghuang Luo ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Property A

NIR-PDT strategy was introduced by employing a nonlinear optical conveyor bearing strong second-harmonic generation (SHG) property. A biocompatible micellic system co-delivered the conveyor and photosensitizer for in situ NIR-PDT.

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