Janelia Fluor® 646, free acid
Chemical Name: 1-[7-(1-Azetidinyl)-10-(2,5-dicarboxyphenyl)-9,9-dimethyl-9-silaanthracen-2(9H)-ylidene]azetidinium inner salt trifluoroacetate
Purity: ≥95%
Biological Activity
Key Information: Janelia Fluor® 646, free acid is a red fluorogenic fluorescent dye; supplied with a free acid reactive group. Suitable for live cell imaging.Application: Suitable for flow cytometry, confocal microscopy, super resolution microscopy (SRM) including dSTORM (in both live and fixed cells) and STED. Used in protocol (2017 Grimm et al - see references below) for the synthesis of Janelia Fluor® HaloTag® and SNAP-Tag® ligands, for use in live cell imaging experiments. Cell permeable.
Properties and Photophysical Data: Excitation and emission maxima (λ) are 646 nm and 664 nm, respectively; quantum yield = 0.54; extinction coefficient = 152,000 M-1cm-1. A280 correction factor = 0.19; lactone-zwitterion equilibrium constant (KL-Z) = 0.0012.
To measure the absorbance spectrum of this dye we recommend the following solvent: ethanol or trifluoroethanol plus 0.1% TFA.
We also offer Janelia Fluor® conjugated antibodies and custom conjugation services with our sister company Novus Biologicals.
HaloTag is a trademark of Promega Corporation, and SNAP-tag is a trademark of New England BioLabs, Inc.
Janelia Fluor is a registered trademark of Howard Hughes Medical Institute.
HaloTag is a trademark of Promega Corporation, and SNAP-tag is a trademark of New England BioLabs, Inc.
Optical Data for Janelia Fluor® 646, free acid
| Emission Color | Red |
|---|---|
| Brightness | |
| λabs | 646 nm |
| λem | 664 nm |
| Extinction Coefficient (ε) | 152,000 M-1cm-1 |
| Quantum Yield (φ) | 0.54 |
| Closest Laser line | 640 nm |
| Reactive Group | Free acid |
| Reactivity | Primary amines |
| Cell Permeable | Yes |
| Correction Factor 280 | 0.19 |
| Application | Flow Cytometry, Confocal Microscopy, dSTORM, STED, Live-cell Imaging |
| Alternative For | Alexa Fluor® 647, Atto 647, Atto 647N, CF640R, CF647, Cyanine 5 |
Alexa Fluor® is a registered trademark of Molecular Probes, Inc, a Thermo Fisher Scientific Company.
Plan Your Experiments
Use our spectra viewer to interactively plan your experiments, assessing multiplexing options. View the excitation and emission spectra for our fluorescent dye range and other commonly used dyes.
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Technical Data
The technical data provided above is for guidance only.
For batch specific data refer to the Certificate of Analysis.
Tocris products are intended for laboratory research use only, unless stated otherwise.
Additional Information
Background References
-
A general method to improve fluorophores for live-cell and single-molecule microscopy.
Grimm et al.
Nat.Methods, 2015;12:244 -
Synthesis of Janelia Fluor HaloTag and SNAP-Tag Ligands and Their Use in Cellular Imaging Experiments.
Grimm et al.
Methods Mol.Biol., 2017;1663:179 -
Rational design of fluorogenic and spontaneously blinking labels for super-resolution imaging.
Zheng et al.
ACS Cent.Sci., 2019;5:1602
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