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Related Concept Videos

Polar Coordinates01:24

Polar Coordinates

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The polar coordinate system offers an alternative to the Cartesian coordinate system for specifying points in a plane, using a distance and an angle instead of x and y coordinates. This system is particularly advantageous in situations involving circular or rotational symmetry, such as in physics or engineering problems involving waves, oscillations, or orbital paths.Defining Polar CoordinatesIn polar coordinates, a point is represented as P(r, ��), where r is the radial distance...
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Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Polar and Cylindrical Coordinates01:22

Polar and Cylindrical Coordinates

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The Cartesian coordinate system is a very convenient tool to use when describing the displacements and velocities of objects and the forces acting on them. However, it becomes cumbersome when we need to describe the rotation of objects. So, when describing rotation, the polar coordinate system is generally used.
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Curvilinear Motion: Polar Coordinates01:27

Curvilinear Motion: Polar Coordinates

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In polar coordinates, the motion of a particle follows a curvilinear path. The radial coordinate symbolized as 'r,' extends outward from a fixed origin to the particle, while the angular coordinate, 'θ,' measured in radians, represents the counterclockwise angle between a fixed reference line and the radial line connecting the origin to the particle.
The particle's location is described using a unit vector along the radial direction. Deriving the particle's position...
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Area Computation by the Alternative Coordinate Method01:24

Area Computation by the Alternative Coordinate Method

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The alternative coordinate method, also known as the Shoelace Formula, is a technique for determining the area of a traverse using Cartesian coordinates. This method relies on the sequential arrangement of x and y coordinates for each point of the shape, ensuring accuracy and ease of application.In this approach, each corner's x and y coordinates are listed as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator. These coordinates are arranged sequentially...
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Coordination Number and Geometry02:57

Coordination Number and Geometry

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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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A Smart Sensing Method for Object Identification Using Circularly Polarized Luminescence from Coordination-Driven

Yuki Imai1, Yuka Nakano2, Tsuyoshi Kawai2

  • 1Department of Applied Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan.

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|May 22, 2018
PubMed
Summary

New chiral luminescence probes enable object identification using circularly polarized luminescence (CPL). These pyrene-based sensors self-assemble with zinc ions, generating CPL signals for distinguishing analytes.

Keywords:
bio-inspired optical materialscircularly polarized luminescencepyrenesensingzinc

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Circularly polarized luminescence (CPL) is a sensitive chiroptical technique.
  • Developing stimuli-responsive luminescent probes is crucial for advanced sensing applications.
  • Pyrene derivatives offer versatile photophysical properties for molecular design.

Purpose of the Study:

  • To develop novel chiral luminescence probes for sensor applications.
  • To demonstrate the use of CPL for object identification.
  • To investigate the self-assembly behavior of pyrene derivatives with metal ions.

Main Methods:

  • Synthesis of pyrene-based chiral probes ((R,R)-Im2Py and (S,S)-Im2Py).
  • Coordination chemistry with tetrahedral metal ions (Zn2+).
  • Characterization of chiroptical properties (CD and CPL) and self-assembly.

Main Results:

  • Probes exhibit no CPL or CD without metal ions.
  • Self-assembly with Zn2+ induces intense CPL and CD signals.
  • The CPL signal can be used to differentiate between target and non-target analytes.

Conclusions:

  • The developed pyrene-based probes are effective for sensing applications.
  • Stimuli-responsive CPL signals enable reliable object identification.
  • This approach offers a new pathway for designing chemical sensors.