Bathophenanthroline丨CAS 1662-01-7

1. Colorimetric Determination of Iron(II)

One of the most prominent uses of bathophenanthroline is in the colorimetric determination of Fe²⁺. It forms a deep red complex with Fe²⁺, allowing sensitive and selective detection.

Assay principle: The bathophenanthroline-Fe²⁺ complex absorbs strongly at ~535 nm.

Applications include:

Trace iron analysis in biological samples (blood serum, tissues)

Food and water testing

Pharmaceutical quality control

Its sensitivity is higher than other iron chelators like 1,10-phenanthroline, making it ideal for ultra-trace analysis.

2. Ligand in Coordination Chemistry

Bathophenanthroline is a versatile ligand forming stable coordination complexes with a wide variety of metals:

Transition metals (Fe, Ru, Co, Cu, Ni, Zn)

Lanthanides

These complexes are used in:

Homogeneous catalysis

Coordination polymer synthesis

Crystallography and structure elucidation

Its planar, aromatic structure provides both π-acceptor and σ-donor properties, enabling diverse coordination modes.

3. Fluorescent and Luminescent Probes

Metal-bathophenanthroline complexes exhibit strong luminescence and are used in:

Fluorescent probes for metal ions (especially Fe²⁺)

Sensitizers in photochemical reactions

Dyes in optoelectronic and OLED research

They are useful in designing molecular sensors, bioimaging agents, and photoredox catalysts.

4. Molecular Recognition and Sensing

Due to its strong metal-binding ability and high selectivity for Fe²⁺, bathophenanthroline is used in the design of:

Chemical sensors for redox-active metal ions

Biochemical assays to track iron concentrations in biological systems

Environmental monitoring devices for water quality assessment

Its chromogenic response allows for easy readouts even with minimal instrumentation.

5. Photochemistry and Photophysics

Bathophenanthroline complexes are studied for their photoactive properties, including:

Electron transfer processes

Energy transfer in supramolecular systems

Light-activated catalysis

These features make bathophenanthroline a key component in:

Photocatalytic water splitting

Artificial photosynthesis research

Light-driven redox cycles

6. Organic Electronics and OLED Materials

Some bathophenanthroline derivatives and their metal complexes are explored for their roles in:

Hole or electron transport materials

Luminescent dyes for organic light-emitting diodes (OLEDs)

Charge recombination centers in photovoltaic devices

Their rigid structure and redox stability contribute to performance enhancement in electronic materials.

7. Supramolecular Chemistry

Bathophenanthroline is used in self-assembly systems due to its rigid, planar structure and ability to coordinate metals in predictable geometries:

Metal–organic frameworks (MOFs)

Supramolecular coordination complexes

Host–guest systems

Such assemblies are valuable in catalysis, drug delivery, and material design.

✅ High Sensitivity and Selectivity

Offers superior sensitivity for Fe²⁺ detection, even at micromolar or nanomolar concentrations.

Highly selective over Fe³⁺, minimizing false positives in mixed samples.

✅ Strong Metal-Ligand Affinity

Forms highly stable complexes with transition metals, enabling long-term use and consistent performance.

✅ Photophysical Versatility

Exhibits strong absorption and fluorescence when bound to metals, useful in spectroscopy, imaging, and sensors.

✅ Robust Structure

Chemically stable under a range of pH and temperature conditions.

Allows usage in harsh analytical or environmental conditions.

✅ Synthetic Flexibility

Can be further functionalized to tune solubility, coordination behavior, or spectroscopic properties.

✅ Colorimetric Detection Simplicity

Requires minimal instrumentation (UV-Vis spectrometer or even visual observation) for effective Fe²⁺ detection.