Fluorescent red 635 reactive 

Amino-reactive biolabel excited by red lasers (He-Ne; 633 nm) and diode lasers (635-650 nm). Molar absorption 200'000 1/M cm, abs: (conjugate) 650 nm, em: (conjugate) 670 nm, QY is fairly low in aqueous media, but up to 0.4 for conjugates.

Hemicyanine dye Fluorescent red 630 match excitation by He-Ne laser line at 633 nm, Argon or Argon-Krypton laser lines at 647 nm and diode lasers (635-650 nm).
Benefits
Ideal match to common excitation light sources
High molar absorption (200.000 M-1cm-1)
Fairly low quantum yield if dissolved inaqueous media, but very strong increase by coupling to target molecule.
Superior solid state fluorescence making them certainly useful to label DNA for preparation of glass arrays

Fluorescent red NHS is an aminoreactive fluorescent biolabel designed for excitation by red lasers (He/Ne; 633 nm) and diode lasers (635 - 650 nm). It can be used for covalent coupling to proteins and other biomolecules containing primary amino groups like aminomodified DNA-oligomers and aminomodified biotin. The chromophore responsible for absoprtion maximum is based on a bridged hemicyanine.
Fluorescent red 635-NHS exhibits a fairly low fluorescence quantum yield if dissolved in aqueous media, but after coupling to a target signal intensity can rise up to one order of magnitude as demonstrated for protein conjugates and labeled oligomers. Together with the quantum yield the fluorescence lifetime increases drastically.
Within the conjugate absorption of the label shifts slightly to the red while position and shape of the emission spectrum remain nearly unchanged.

for fluorescence

BioChemika

λ_ex 635 nm; λ_em 665 nm in 0.1 M phosphate pH 7.0 (non-covalent binding to BSA enhances fluorescence emission)

DMF: soluble

2-8°C

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