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ligomeric Phosphate refers to a group of phosphate compounds that consist of a few (oligo) phosphate units linked together through phosphoanhydride bonds.
These compounds are commonly used in water treatment, detergents, and as dispersing agents due to their ability to chelate metal ions and stabilize formulations.
Synonyms:
Polyphosphate (short-chain),Short-chain polyphosphates,Sodium polyphosphate (when sodium is the counterion),Sodium hexametaphosphate (SHMP) – specific oligomer,Sodium tripolyphosphate (STPP) – specific oligomer,Glassy phosphate (in industrial context)
Cas Number:7758-29-4
Introduction
Oligomeric phosphates are phosphate compounds consisting of a few repeating phosphate units linked through oxygen bridges.
They serve as an intermediate class of compounds between simple orthophosphates and high molecular weight polyphosphates.
Oligomeric phosphates have gained increasing attention in industrial, environmental, and biological contexts due to their unique chemical behavior, functionality, and reactivity.
Historically, phosphates have played a vital role in biochemical energy transfer (e.g., ATP) and materials processing.
The early study of oligomeric phosphates in the mid-20th century laid the foundation for their modern-day applications in detergents, corrosion inhibitors, and biomedical formulations.
Their ability to chelate metals, buffer pH, and participate in complex reactions makes them indispensable in many scientific and engineering domains.
Chemical Structure and Classification
Oligomeric phosphates are characterized by chains or rings of phosphorus atoms linked via P–O–P bridges.
The structural diversity of these compounds allows them to be classified as:
Linear oligomers (e.g., triphosphate, tetraphosphate): straight chains with terminal phosphate groups.
Cyclic oligomers (e.g., cyclo-triphosphate): ring-like structures with internal P–O–P links.
Branched oligomers: phosphates forming cross-linked or branched topologies.
Each phosphate unit typically consists of a central phosphorus atom surrounded tetrahedrally by oxygen atoms.
The degree of oligomerization significantly affects solubility, reactivity, and metal complexation ability.
Synthesis and Production
Laboratory Methods
Oligomeric phosphates can be synthesized via controlled polycondensation of orthophosphoric acid or its salts at elevated temperatures.
The reaction involves the elimination of water:
Alternatively, sodium salts of oligophosphates are obtained through partial hydrolysis of sodium hexametaphosphate.
Industrial Production
Industrially, oligomeric phosphates are produced in large volumes through thermally controlled reactions and spray drying.
Key raw materials include phosphoric acid, sodium carbonate, and ammonium salts.
Process parameters such as temperature, pH, and concentration influence the degree of polymerization.
Pilot-scale batch reactors and continuous processing units are employed.
Physicochemical Properties
Oligomeric phosphates exhibit diverse physical and chemical properties:
Solubility: Highly soluble in water, especially in their sodium and potassium salt forms.
pH Behavior: Act as buffering agents; the pKa values vary with the number of phosphate units.
Thermal Stability: Stable up to 250–300°C; decomposition leads to pyrophosphates and metaphosphates.
Viscosity: Increases with oligomer length, influencing handling in industrial applications.
They demonstrate distinct IR, NMR, and UV-Vis spectroscopic features, allowing for analytical identification.
Analytical Methods
Characterization and quantification of oligomeric phosphates require precise analytical methods:
NMR Spectroscopy: 31P-NMR provides insights into the number and position of phosphate units.
FTIR and Raman Spectroscopy: Used to detect P–O–P and P=O vibrations.
Mass Spectrometry (ESI-MS): Determines molecular weight distribution.
Ion Chromatography (IC): Separates and quantifies different oligomeric species.
Colorimetric Assays: Molybdenum blue method for phosphate content.
Reactivity and Interactions
Oligomeric phosphates are chemically active and display the following reactivities:
Hydrolysis: Degrades into shorter chain phosphates in aqueous environments.
Metal Complexation: Chelates transition metals such as Fe, Zn, and Ca, forming stable complexes.
Acid-Base Behavior: Multiple protonation states make them effective as multivalent buffers.
Exchange Reactions: Participate in ligand exchange and phosphorylation reactions.
Biological and Biochemical Roles
Naturally occurring oligophosphates are found in DNA backbones, ATP derivatives, and signaling molecules. They play crucial roles in:
Energy Transfer: Triphosphates (like ATP) are vital for metabolic energy.
Signal Transduction: Inositol phosphate oligomers are involved in cellular signaling.
Enzymatic Reactions: Serve as substrates or cofactors in biochemical transformations.
Synthetic oligomeric phosphates are used to mimic biological systems for drug development.
Applications in Industry
Oligomeric phosphates are widely used in several industrial sectors:
Water Treatment: Act as antiscalants and sequestering agents.
Detergents: Improve cleaning efficiency and soften water.
Ceramics and Glass: Serve as dispersants and flux agents.
Corrosion Inhibitors: Protect metal surfaces from oxidation.
Flame Retardants: Enhance thermal resistance in polymers.
Pharmaceutical and Biomedical Applications
Recent research has led to the development of oligomeric phosphate-based materials for:
Controlled Drug Release: Oligophosphate coatings for pharmaceuticals.
Diagnostic Agents: MRI and X-ray contrast enhancers.
Antibacterial Agents: Disrupt microbial metabolic pathways.
Bone Regeneration: Bioceramic composites containing phosphate oligomers.
Environmental Impact
While useful, oligomeric phosphates pose ecological concerns:
Biodegradability: Slow degradation can contribute to phosphorus pollution.
Eutrophication: Excess phosphates lead to algal blooms in aquatic systems.
Bioaccumulation: Risk of buildup in soil and sediment.
Efforts are underway to design eco-friendly variants and promote phosphate recovery from wastewater.
SAFETY INFORMATION ABOUT OLIGOMERIC PHOSPATE
First aid measures:
Description of first aid measures:
General advice:
Consult a physician.
Show this safety data sheet to the doctor in attendance.
Move out of dangerous area:
If inhaled:
If breathed in, move person into fresh air.
If not breathing, give artificial respiration.
Consult a physician.
In case of skin contact:
Take off contaminated clothing and shoes immediately.
Wash off with soap and plenty of water.
Consult a physician.
In case of eye contact:
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Continue rinsing eyes during transport to hospital.
If swallowed:
Do NOT induce vomiting.
Never give anything by mouth to an unconscious person.
Rinse mouth with water.
Consult a physician.
Firefighting measures:
Extinguishing media:
Suitable extinguishing media:
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas
Advice for firefighters:
Wear self-contained breathing apparatus for firefighting if necessary.
Accidental release measures:
Personal precautions, protective equipment and emergency procedures
Use personal protective equipment.
Avoid breathing vapours, mist or gas.
Evacuate personnel to safe areas.
Environmental precautions:
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Methods and materials for containment and cleaning up:
Soak up with inert absorbent material and dispose of as hazardous waste.
Keep in suitable, closed containers for disposal.
Handling and storage:
Precautions for safe handling:
Avoid inhalation of vapour or mist.
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place.
Containers which are opened must be carefully resealed and kept upright to prevent leakage.
Storage class (TRGS 510): 8A: Combustible, corrosive hazardous materials
Exposure controls/personal protection:
Control parameters:
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls:
Appropriate engineering controls:
Handle in accordance with good industrial hygiene and safety practice.
Wash hands before breaks and at the end of workday.
Personal protective equipment:
Eye/face protection:
Tightly fitting safety goggles.
Faceshield (8-inch minimum).
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
Skin protection:
Handle with gloves.
Gloves must be inspected prior to use.
Use proper glove
removal technique (without touching glove's outer surface) to avoid skin contact with this product.
Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices.
Wash and dry hands.
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
Splash contact
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
It should not be construed as offering an approval for any specific use scenario.
Body Protection:
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection:
Where risk assessment shows air-purifying respirators are appropriate use a fullface respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls.
If the respirator is the sole means of protection, use a full-face supplied air respirator.
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Stability and reactivity:
Chemical stability:
Stable under recommended storage conditions.
Incompatible materials:
Strong oxidizing agents:
Hazardous decomposition products:
Hazardous decomposition products formed under fire conditions.
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas.
Disposal considerations:
Waste treatment methods:
Product:
Offer surplus and non-recyclable solutions to a licensed disposal company.
Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging:
Dispose of as unused product
