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Updated: Jun 1, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
Bis(ethyl-enediammonium) tetra-deca-borate
Guo-Ming Wang1, Pei Wang, Zeng-Xin Li
1Department of Chemistry, Teachers College of Qingdao University, Qingdao, Shandong 266071, People's Republic of China.
Researchers synthesized a novel borate compound featuring a unique three-dimensional network structure. This supramolecular framework, built from tetra-deca-borate anions and ethylenediammonium cations, exhibits extensive hydrogen bonding interactions.
Area of Science:
- Inorganic Chemistry
- Crystal Engineering
- Supramolecular Chemistry
Background:
- Borate compounds exhibit diverse structural motifs and hydrogen bonding capabilities.
- Supramolecular networks are crucial for designing materials with tailored properties.
Purpose of the Study:
- To synthesize and characterize a novel tetra-deca-borate compound.
- To investigate the supramolecular structure and hydrogen bonding interactions within the crystal.
Main Methods:
- Single-crystal X-ray diffraction analysis.
- Characterization of the inorganic-organic hybrid structure.
- Analysis of hydrogen bonding networks.
Main Results:
- A novel centrosymmetric tetra-deca-borate anion was identified.
- The anions form a 3D supramolecular network via O-H⋯O hydrogen bonds.
- Ethylenediammonium cations are incorporated within the network channels through N-H⋯O hydrogen bonds.
Conclusions:
- The study reveals a new borate supramolecular framework with potential applications in materials science.
- The extensive hydrogen bonding dictates the overall crystal structure and cation-anion interactions.
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The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
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