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
Biological ActivityJanelia Fluor® 646, free acid is a red fluorogenic fluorescent dye; supplied as a free acid. 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. Suitable for confocal fluorescent imaging, super resolution microscopy (SRM) techniques such as dSTORM (live and fixed cells) and STED imaging. Also suitable for flow cytometry. Cell permeable. Excitation maximum = 646 nm; emission maximum = 664 nm; Quantum yield = 0.54; Extinction coefficient = 152,000 M-1cm-1.
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.
Optical Data for Janelia Fluor® 646, free acid
|Extinction Coefficient (ε)||152,000 M-1cm-1|
|Quantum Yield (φ)||0.54|
|Closest Laser line||640 nm|
|Reactive Group||Free acid|
|Correction Factor 280||0.19|
|Application||Confocal imaging, dSTORM, STED, Flow|
|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.Spectral Viewer
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.
Complete Your Research
Complete Your Experiment
A general method to improve fluorophores for live-cell and single-molecule microscopy.
Grimm et al.
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
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