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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Coordination Number and Geometry02:57

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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The Dot Product01:26

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Measuring how one directional quantity affects another along a specific path involves comparing their orientation and strength. When two such quantities are represented using direction and amount, a numerical result is computed to show how much one acts along the path of the other. This result comes from a rule combining both inputs' horizontal and vertical parts and adding the results.This calculation gives a single value that grows larger when both inputs point in similar directions and...
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Production and Targeting of Monovalent Quantum Dots
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Improving cytocompatibility of CdTe quantum dots by Schiff-base-coordinated lanthanides surface doping.

Hana Buchtelova1, Vladislav Strmiska1, Zuzana Skubalova1

  • 1Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, 613 00, Brno, Czech Republic.

Journal of Nanobiotechnology
|April 21, 2018
PubMed
Summary

Lanthanide-doped quantum dots (QDs) offer improved cytocompatibility for bio-labeling. This study demonstrates that doping CdTe QDs with lanthanides significantly reduces their toxicity, enhancing their potential for various biological applications.

Keywords:
Cellular labelingCytotoxicityInorganic fluorophoreNanocrystalSurface dopant

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Area of Science:

  • Nanotechnology
  • Biomedical Engineering
  • Materials Science

Background:

  • Quantum dots (QDs) are promising fluorophores for imaging but exhibit significant toxicity.
  • Surface chemistry critically influences QD biological behavior and toxicity.
  • Developing cytocompatible QDs is essential for in vivo applications.

Purpose of the Study:

  • To synthesize novel, cytocompatible lanthanide-doped (Ln-doped) cadmium telluride (CdTe) quantum dots.
  • To evaluate the impact of lanthanide doping on QD optical properties and cellular toxicity.
  • To assess the potential of Ln-doped QDs for in vitro bio-labeling applications.

Main Methods:

  • Two-step microwave-assisted synthesis of CdTe QDs doped with Yb3+, Tb3+, and Gd3+.
  • Characterization of nanocrystal properties, including water solubility, colloidal stability, and fluorescence quantum yields.
  • In vitro assessment of cytocompatibility, including endocytosis, intracellular accumulation, reactive oxygen species generation, hemolysis, protein adsorption, and genotoxicity.
  • Site-directed conjugation of antibodies for immuno-labeling of the human norepinephrine transporter (hNET).

Main Results:

  • Synthesized water-soluble QDs with high fluorescence stability (40.9-58.0% quantum yields).
  • Ln-doping significantly enhanced cytocompatibility compared to un-doped CdTe QDs, with minimal toxicity observed, especially for TbQDs.
  • Validated in vitro applicability using TbQDs for immuno-labeling of hNET in various cell types, including neuroblastoma cells.

Conclusions:

  • Lanthanide doping effectively alleviates the cytotoxic effects of CdTe QDs.
  • Ln-doped QDs exhibit great potential as cytocompatible and stable fluorophores for diverse bio-labeling applications.
  • This work paves the way for safer and more effective fluorescent probes in biomedical research.