Sodiummercaptododecaborate,BSH,10Benriched (CAS 12448-24-7): A Key Boron Cluster Compound for BNCT R

Introduction

Sodiummercaptododecaborate,BSH,10Benriched (CAS 12448-24-7), is a boron-rich cluster compound that plays a significant role in boron neutron capture therapy (BNCT) research. Due to its high boron density, stable closo-dodecaborate framework, and isotopic enrichment with boron-10, BSH has been extensively investigated as a boron delivery agent for targeted radiotherapy.

Its unique combination of structural stability and biological applicability makes it one of the most studied boron cluster compounds in translational oncology research.

Structural Features and Chemical Characteristics

BSH is based on an icosahedral closo-dodecaborate (B₁₂) cluster, a highly stable boron cage structure characterized by:

• High boron atom density per molecule
• Exceptional thermal and chemical stability
• Ionic, water-soluble nature
• Thiol (-SH) functional group enabling conjugation chemistry

The thiol functionality allows further derivatization or biomolecular conjugation, facilitating targeted delivery strategies in biomedical applications.

When enriched with the 10B isotope, the compound becomes particularly valuable for neutron capture applications due to the high neutron absorption cross-section of boron-10.

Role in Boron Neutron Capture Therapy (BNCT)

BNCT is a binary cancer treatment modality that relies on the nuclear reaction between boron-10 and low-energy thermal neutrons. Upon neutron capture, boron-10 undergoes fission, producing high-linear energy transfer (LET) particles that induce localized cytotoxicity.

For effective BNCT, a boron carrier must:

1. Deliver sufficient boron atoms selectively to tumor tissue

2. Exhibit low systemic toxicity

3. Maintain chemical stability under physiological conditions

10B-enriched BSH fulfills these criteria due to:

• High boron payload per cluster
• Favorable aqueous solubility
• Established safety profile in clinical investigations
• Reliable neutron capture efficiency

As a result, BSH has been widely used in preclinical and clinical BNCT studies, particularly in brain tumors and other malignancies.

Applications Beyond BNCT

Although primarily known for BNCT research, 10B-enriched sodium mercaptododecaborate also serves broader purposes in:

Radiopharmaceutical Research

The thiol functionality enables conjugation to biomolecules or targeting vectors, supporting advanced drug delivery strategies.

Boron Cluster Chemistry

BSH is a valuable precursor in the synthesis of modified boron clusters and functionalized dodecaborate derivatives.

Coordination and Materials Chemistry

The boron cage framework can participate in metal coordination studies and supramolecular assemblies, expanding its relevance beyond medical research.

Importance of 10B Isotopic Enrichment

Isotopic enrichment significantly enhances the neutron capture performance of BSH. Natural boron contains approximately 20% boron-10, whereas enriched materials provide substantially higher neutron absorption efficiency, improving therapeutic precision and reducing required dosage.

High isotopic purity is therefore critical for:

• Clinical-grade BNCT research
• Reactor-based neutron irradiation studies
• Quantitative dosimetry optimization

Conclusion

Sodiummercaptododecaborate,BSH,10Benriched (CAS 12448-24-7), represents a cornerstone compound in boron neutron capture therapy research. Its stable boron cluster framework, high boron content, and isotopic optimization make it an indispensable material in oncological radiotherapy studies and advanced boron chemistry.

As interest in targeted radiotherapeutics continues to expand, 10B-enriched BSH remains a key compound bridging inorganic boron cluster chemistry and clinical oncology applications.