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Related Concept Videos

Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...
Unsymmetric Bending01:18

Unsymmetric Bending

Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The orientation of the...
Symmetry Elements in a Crystal01:27

Symmetry Elements in a Crystal

Crystal symmetry operations are isometric transformations that map objects onto indistinguishable copies while preserving distances, angles, and volumes. The simplest symmetry operation is translation, which shifts the entire infinite crystal lattice parallelly by a translation vector.Crystallographic rotations involve rotations by an angle of 2π/n around an axis without changing the positions of points on the axis. It is called the rotational axis of the symmetry, denoted by n. The combination...
Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal centroidal axes. The...
Symmetric Member in Bending01:07

Symmetric Member in Bending

In the study of the mechanics of materials, analyzing the behavior of prismatic members under opposing couples is crucial for understanding internal stress distributions, which are essential for structural design. When subjected to couples, a prismatic member experiences internal forces that maintain equilibrium. A couple, characterized by two equal and opposite forces, creates a moment but no resultant force. The internal forces at any section cut of the member must balance these external...
Symmetry01:26

Symmetry

The equation of an ellipse centered at the origin defines all points whose distances from the center maintain a constant ratio between the horizontal and vertical axes. This equation results in a smooth, closed curve that extends further along the x-axis than the y-axis, giving it a horizontal orientation. Such an ellipse demonstrates three kinds of symmetry: across the x-axis, across the y-axis, and about the origin. These symmetries are essential in understanding the graph's structure and...

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Related Experiment Video

Updated: Jun 19, 2026

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
09:46

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Published on: August 19, 2013

Unsymmetrical cruciforms.

Juan Tolosa1, Kyril M Solntsev, Laren M Tolbert

  • 1School of Chemistry and Biochemistry, Georgia Institute of Technology, 901 Atlantic Drive, Atlanta, Georgia 30332-0400, USA.

The Journal of Organic Chemistry
|October 28, 2009
PubMed
Summary
This summary is machine-generated.

New unsymmetrical cruciforms (XF) were synthesized and studied. These stilbene derivatives show significant emission changes upon metal ion complexation, indicating their potential as platforms for metal ion detection.

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Last Updated: Jun 19, 2026

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
09:46

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Published on: August 19, 2013

Bottom-Up In Vitro Methods to Assay the Ultrastructural Organization, Membrane Reshaping, and Curvature Sensitivity Behavior of Septins
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Bottom-Up In Vitro Methods to Assay the Ultrastructural Organization, Membrane Reshaping, and Curvature Sensitivity Behavior of Septins

Published on: August 17, 2022

Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photophysics

Background:

  • 1,4-Distyryl-2,5-bisphenylethynylbenzenes (cruciforms, XF) are a class of organic molecules with potential applications in materials science.
  • Understanding their optical properties and response to external stimuli is crucial for developing new functional materials.

Purpose of the Study:

  • To synthesize and characterize new unsymmetrical cruciforms (XF) with diverse substituents.
  • To investigate the optical properties of these XFs, particularly their response to protonation and metal cation binding.
  • To evaluate the potential of these XFs as platforms for metal ion detection.

Main Methods:

  • Sequential Horner reaction for synthesis of unsymmetrical XFs.
  • Sonogashira coupling for introducing phenylacetylene moieties.
  • UV-Vis absorption and fluorescence spectroscopy for optical property investigation.
  • Trifluoroacetic acid titration for studying protonation effects.
  • Metal cation titration for studying cation binding effects.

Main Results:

  • Five new unsymmetrical XFs with donor, acceptor, and donor-acceptor substituents were successfully synthesized.
  • Protonation induced distinct spectral shifts (blue or red) depending on the substituent.
  • Metal cation binding mirrored protonation trends, with significant ratiometric changes in emission.
  • XFs did not exhibit kinetic photoacidity or dynamic excited-state decomplexation.

Conclusions:

  • The synthesized XFs exhibit tunable optical properties based on their substituents.
  • The observed spectral changes upon protonation and metal cation binding highlight their potential as responsive materials.
  • Distyrylbenzene-derived cruciforms show promise as platforms for sensitive and selective metal ion detection.