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Author

S. Shanmuga Sundara Raj

Other affiliations: Nagoya University
Bio: S. Shanmuga Sundara Raj is an academic researcher from Universiti Sains Malaysia. The author has contributed to research in topics: Ring (chemistry) & Hydrogen bond. The author has an hindex of 14, co-authored 154 publications receiving 986 citations. Previous affiliations of S. Shanmuga Sundara Raj include Nagoya University.

Papers published on a yearly basis

Papers
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Journal ArticleDOI
TL;DR: In this article, the triboluminescence of three non-ionic europium complexes, Eu(TTA)3·bipy (1), Eu[TTA]3·dia (2) and Eu•DBM·H2O (3) (TTA = 2-thenoyltrifluoroacetonate, DBM = dibenzoylmethanate, bipy = 2,2′-bipyridine, dia = 4,5-diazafluoren-
Abstract: The triboluminescence of three non-ionic europium complexes, Eu(TTA)3·bipy (1), Eu(TTA)3·dia (2) and Eu(DBM)3·dmbp·H2O (3) (TTA = 2-thenoyltrifluoroacetonate, DBM = dibenzoylmethanate, bipy = 2,2′-bipyridine, dia = 4,5-diazafluoren-9-one, dmbp = 4,4′-dimethyl-2,2′-bipyridinate), was observed. Structure determinations of 1 and 3 were carried out. The triboluminescence maxima of 1 and 2 are similar to those of their photoluminescence. The disorder of the thienyl ring and CF3 groups in 1 and the disorder of water in the packing of 3 may be responsible for their triboluminescent activity.

68 citations

Journal ArticleDOI
TL;DR: The chelating properties of 4-(p-methylphenyl)-3,5-bis(pyridin-2-yl)-1,2,4-triazole (MBPT) were investigated through the study of the crystal structures of [Co(MBPT]2(H2O)2](ClO4)2·4 H2O (1), [Ni(MB PT)2 (H 2O) 2 ] and MBPT and the analysis of IR and ESIMS spectra as mentioned in this paper.

63 citations

Journal ArticleDOI
TL;DR: Acyclic dicompartmental ligands suitable for the complexation of transition-metal ions which can form mononuclear, homo- or heterodinuclear complexes have been synthesized.

61 citations

Journal ArticleDOI
TL;DR: In this paper, the synthesis and X-ray characterization of the first example of an L-lactic acid two-dimensional metal coordination polymer with an additional bridging ligand was reported.
Abstract: The synthesis and X-ray characterization of the first example of an L-lactic acid two-dimensional metal coordination polymer with an additional bridging ligand, (S-(-)-lactate)(isonicotinato)zinc(II), (S-µ-2-hydroxypropanoinato)zinc(II), 1 is reported. It crystallizes in the acentric orthorhombic space group P212121 and displays powder SHG efficiencies ca. 1.2 times that of urea.

60 citations

Journal ArticleDOI
TL;DR: The first metal coordination polymer containing 3,4′-bipyridine (3, 4′bpy) was prepared by the hydrothermal treatment of Cu(NO3)2·2.5H2O, Me3SnBr and 3, 4´bpy as mentioned in this paper.
Abstract: The first metal coordination polymer containing3,4′-bipyridine (3,4′-bpy) was prepared by the hydrothermal treatment of Cu(NO3)2·2.5H2O, Me3SnBr and3,4′-bpy and its crystal structure shows a infinite double chain composed of two 3,4′-bpy and Br as well as copper(I) ions with an approximately rectangular molecular box of 4.0 × 10.68 A.

46 citations


Cited by
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Journal ArticleDOI
10 Mar 1970

8,159 citations

Journal ArticleDOI
TL;DR: The trivalent europium ion (Eu3+) is well known for its strong luminescence in the red spectral region, but this ion is also interesting from a theoretical point of view as mentioned in this paper.

1,906 citations

Journal ArticleDOI
TL;DR: In this article, the design and structure of coordination polymers derived from Ag(I) with N-donor ligands and their role in the investigation of weak non-covalent interactions in the solid state are discussed.

1,085 citations

Journal ArticleDOI
TL;DR: The term nonlinear optics (NLO) was coined to describe the nonlinear relationship between dielectric polarization P and electric field E in optical media to develop materials with the ability to alter the frequency of light, to amplify light signal, and to modulate light intensity or phase factors.
Abstract: The term nonlinear optics (NLO) was coined to describe the nonlinear relationship between dielectric polarization P and electric field E in optical media. NLO is a cornerstone of the emerging field of photonics, in which photons instead of electrons are used for signal transmission and processing. The vision of photonic signal transmission, processing, and storage has attracted a great deal of attention from both the engineering and the scientific communities because of its great impact in many of the existing and future information technologies. The first step toward realization of these revolutionary technologies is to develop tools to manipulate photons. For example, it is desirable to develop materials with the ability to alter the frequency of light, to amplify light signal, and to modulate light intensity or phase factors. NLO phenomena can be the key to achieving these important functions. One of the most common NLO behaviors is second-harmonic generation (SHG), in which a NLO material mediates the “adding-up” of two photons to form a new one with twice the frequency. The SHGphenomenonwas first demonstrated by Franken et al. in 1961. In their pioneering work, a laser beam with a wavelength of 694.2 nm was irradiated through a quartz crystal and an output ultraviolet radiation with a wavelength of 347.1 nm (double frequency) was detected. After this discovery, numerous nonlinear optical phenomena have been studied and a number of NLO-active materials have been developed. Second-harmonic generation can be quantitatively described by the second-order nonlinear optical susceptibility χ, a third-rank tensor with 27 components. The tensor elements are related to each other tomeet the requirements of both inherent and structural symmetries, which greatly reduces the number of independent components of the susceptibility tensor. Only crystals in noncentrosymmetric crystal classes can have nonvanishing χ. Moreover, for material crystallizing in the noncentrosymmetric 422, 622, and 432 crystal classes, the second-order NLO response might also vanish due to structural symmetry as well as Kleinman’s symmetry. Many inorganic compounds crystallize in noncentrosymmetric space groups and have been found to be SHG active. Some important examples are potassium dihydrogen phosphate (KDP = KH2PO4), lithium niobate (LiNbO3), and barium sodium niobate (Ba2NaNb5O15). 7 New inorganic compounds have been explored for NLO applications including but not limited to metal borates 12 and metal oxides. Recent structural studies on the inorganic systems have led to a better understanding of crystal growth/packing, paving the way for potentially manipulating their crystallization tendency to form noncentrosymmetric structures. Since the 1970s molecular NLO materials, including organic, organometallic, and inorganic complexes, have been of increasing interest to synthetic chemists. 19 The existing library of organic compounds was first screened, and the urea crystal has become a SHG standard because of its high SHG efficiency and usual availability. In a microscopic view, the second-order NLO susceptibility χ is related to the first hyperpolarizability β of a molecule. According to the classical two-level model, β is enhanced by a large transition moment and a large dipole moment difference between the ground and the charge transfer excited state. A donor acceptor type of molecule often possesses both a large transition moment and a large excited state dipole moment. As a result, most of the organic SHG chromophors belong to this category. However, most of the molecules with large β values also possess a large dipole moment, which induces formation of centrosymmetric assemblies of molecules due to dipole dipole interactions. One of the methods to avoid the centrosymmetric alignment of molecular dipoles is to trap them inside the channels of asymmetric porous host structures. 28 Other methods include formation of poled polymers in which the required asymmetry is imposed by the external electric field 35 and the Langmuir Blodgett (LB)

888 citations

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TL;DR: In this article, the authors reviewed the literature on organotin(IV) complexes taking into account the biological aspects of the complexes discussed and provided useful information about the structure and stabilities of the complex formed.

544 citations