A polymorph structure of copper(II) hydrogenphosphite dihydrate.

Area of Science:

• Inorganic Chemistry
• Crystal Engineering
• Materials Science

Background:

• Copper(II) hydrogen phosphite compounds exhibit diverse structural motifs.
• Understanding structure-property relationships in coordination polymers is crucial for materials development.

Purpose of the Study:

• To synthesize and characterize a novel layered copper(II) hydrogen phosphite polymorph.
• To compare the structural features of the new polymorph with a known 3D microporous analogue.

Main Methods:

• Hydrothermal synthesis at 393 K.
• Single-crystal X-ray diffraction at 193 K.
• Structural analysis and comparison of coordination environments and network topologies.

Main Results:

• A new layered structure, poly[[diaqua-copper(II)]-μ(3)-hydrogenphosphito], [Cu(HPO(3))(H(2)O)(2)](n), was successfully synthesized.
• Both polymorphs feature square-pyramidal copper(II) coordination, with distorted octahedral geometry considered.
• The layered structure (I) contrasts with the 3D microporous framework of polymorph (II), linked by inversion and screw-axis symmetries, respectively.
• Strong O-H⋯O hydrogen bonds are present in both structures.

Conclusions:

• The study presents a new layered copper hydrogen phosphite, expanding the known structural diversity of these materials.
• The comparison between the 2D layered and 3D microporous polymorphs provides insights into crystal engineering strategies.
• The presence of strong hydrogen bonds plays a significant role in stabilizing both crystal structures.