Compounds of glycine with halogen or metal halogenides: review and comparison

Crystal Growth, Optical, Mechanical and Dielectric Analysis of Semiorganic Glycine Manganese Sulphate Single Crystal for Opto‐Electronic Device Application

Glycine manganese sulphate (GMS) crystals are produced by a slow evaporation technique at room temperature. This is confirmed that triclinic of the crystal lattice system by using single crystal X‐ray diffraction analysis and to determine the lattice parameters of the synthesised crystals. Powder XRD is used to confirm the planar indexing and crystalline structure. The Fourier Transform Infrared (FT‐IR) spectra are examined to verify that functional groups are present in the generated GMS crystals. By establishing a cut‐off wavelength of 253 nm, spectra of visible, near‐infrared, and Ultra Violet (UV) light from 200 to 1100 nm are analyzed. At frequencies ranging from 100 Hz to 8 MHz, the grown crystal's dielectric response is studied. Vickers microhardness tester is utilized to find out how strong the grown crystal is mechanically. Photoluminescence (PL) investigations often aim to detect crystal formation faults and contaminants. Etching analysis is used to find surface flaws and dislocations on the formed crystal's surface. The internal surface property of the produced crystal is investigated with scanning electron microscopy (SEM). The findings contradicted each other, suggesting that the created GMS crystal be used in opto‐electronic device applications.

A Fluorescence Turn On-off-on Method for Sensitive Detection of Sn2+ and Glycine Using Waste Eggshell Membrane Derived Carbon Nanodots as Probe

Changes in Sn2+ and glycine levels are relevant to many important physiological procedures in human health. However, investigation of their physiological functions is limited because few versatile methods towards Sn2+ and glycine detection have been developed. In this work, a fluorescence turn on-off-on strategy was firstly constructed for rapid and sensitive detection of Sn2+ and glycine through the specific binding between Sn2+ and glycine. Carbon nanodots (CDs) with a quantum yield of 19.5% were synthesized by utilizing inner film of waste eggshell as carbon source and employed as fluorescent probe. In the presence of Sn2+, the fluorescence of CDs was quenched by Sn2+ via the primary inner filter effect (IFE). However, the binding between Sn2+ and glycine prevented the IFE between Sn2+ and CDs, resulting in fluorescence recovery of CDs. Under optimized conditions, the fluorescent response of CDs displayed good linear relationships with the concentrations of Sn2+ in the range of 10-200 µM and 200-5000 µM, and the limit of detection (LOD) was 2.4 µM. For glycine detection, a good linear relationship was obtained in the concentration range of 5-1000 µM with a low LOD down to 0.76 µM. Moreover, the practicability of the assay was also demonstrated by measuring glycine content in human serum samples. This work provides an economical, green and fast method for biological analysis of Sn2+ and glycine.

An unusual linker and an unexpected node: CaCl2 dumbbells linked by proline to form square lattice networks

Extensive database searches using the network approach underline that the sql-topology is unusual for carboxylato bridged networks.

catena-Poly[[[aqua-(glycine-κO)lithium]-μ-glycine-κ(2) O:O'] bromide]

In the title coordination polymer, {[Li(C₂H₅NO₂)₂(H₂O)]Br}_n, the Li⁺ cation is coordinated by three carboxyl­ate O atoms of zwitterionic glycine mol­ecules and by a water mol­ecule, forming a distorted tetra­hedral geometry. One of the two glycine mol­ecules bridges neighbouring complexes, forming an infinite chain parallel to the c axis. Polymeric chains are further linked by extensive hydrogen bonds involving the Br⁻ anions and glycine and water mol­ecules, producing a three-dimensional network.

Structural, vibrational and thermal studies of a new nonlinear optical material: L-asparagine-L-tartaric acid

Crystals of a new nonlinear optical (NLO) material, viz., L-asparagine-L-tartaric acid (LALT) (1) were grown by slow evaporation of an aqueous solution containing equimolar concentrations of L-asparagine and L-tartaric acid. The structure of the title compound which crystallizes in the non-centrosymmetric monoclinic space group P2(1) consists of a molecule of L-asparagine and a molecule of free l-tartaric acid both of which are interlinked by three varieties of H-bonding interactions namely O-H···O, N-H···O and C-H···O. The UV-Vis-NIR spectrum of 1 reveals its transparent nature while the vibrational spectra confirm the presence of the functional groups in 1. The thermal stability and second harmonic generation (SHG) conversion efficiency of 1 were investigated.

New compounds of glycine with metal halogenides

The crystal structures of five new glycine (H2N–CH2–COOH) metal halogenide compounds were determined by single crystal X-ray diffraction. Three of them are monoclinic phases, GlycineCaCl2 · 3 H2O (space group P21/c, a = 9.964(2), b = 6.868(1), c = 13.959(3) Å, β = 104.11(3)°, R1 = 0.024), GlycineZnCl2 · H2O (space group P21/a, a = 7.868(1), b = 9.124(1), c = 10.645(1) Å, β = 103.51(1)°, R1 = 0.026) and Glycine2ZnCl2 · 2 H2O (space group C2/c, a = 14.444(1), b = 6.916(1), c = 12.968(1) Å, β = 117.90(3)° R1 = 0.033), two of them are orthorhombic phases Glycine3CeCl3 · 3 H2O (space group P212121, a = 4.788(1), b = 12.074(2), c = 30.949(6) Å R1 = 0.034) and Glycine2CaI2 · 3 H2O (space group Pca21, a = 13.059(3), b = 9.862(2), c = 22.724(5) Å R1 = 0.023). The atomic arrangements as well as aspects of the crystal chemistry of these compounds are presented.