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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

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Assessing the guest-accessible volume in MOFs using two-photon fluorescence microscopy.

Sung Min Shin1, Mi Sun Lee, Ji Hee Han

  • 1Department of Chemistry, Korea University, Seoul, 136-701, Korea. njeong@korea.ac.kr.

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|August 21, 2013
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Two-photon confocal fluorescence microscopy (TPM) with various dyes can reliably assess guest-accessible volume in metal-organic frameworks (MOFs). This method is applicable to diverse porous and non-crystalline materials.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Accurate assessment of guest-accessible volume is crucial for understanding porous materials.
  • Traditional methods often require single-crystal structures, limiting their applicability.
  • Metal-organic frameworks (MOFs) possess tunable porosity, making their volume assessment important.

Purpose of the Study:

  • To establish a reliable method for assessing guest-accessible volume in porous materials.
  • To demonstrate the utility of two-photon confocal fluorescence microscopy (TPM) for this purpose.
  • To extend the applicability of volume assessment to materials lacking single-crystal structures.

Main Methods:

  • Utilized two-photon confocal fluorescence microscopy (TPM).
  • Employed a diverse set of fluorescent dyes with varying molecular sizes.
  • Applied the method to metal-organic frameworks (MOFs) and other porous materials.

Main Results:

  • Successfully demonstrated reliable assessment of guest-accessible volume in MOFs using TPM.
  • Showcased the ability of TPM to differentiate pore accessibility based on dye size.
  • Validated the method's effectiveness for materials without single-crystal structures.

Conclusions:

  • Two-photon confocal fluorescence microscopy (TPM) offers a robust tool for evaluating guest-accessible volume in MOFs.
  • The dye-based TPM approach is versatile and applicable to a broad range of porous and non-crystalline materials.
  • This technique overcomes limitations of methods requiring crystalline structures.