Lattice Matching (LM)—Prevention of Inadvertent Duplicate Publications of Crystal Structures
Lattice-matching techniques have proved to be extremely effective for the identification of unknown crystalline materials. A commonly employed lattice-matching strategy is based on matching the reduced cell of an unknown against a database of known materials represented by their respective standard reduced cells. The success of the method relies on the fact that the lattice or the lattice plus chemical information (e.g., element types) is highly characteristic of a material—like a fingerprint. Because of its intrinsic power, the procedure has many and diverse applications—in materials characterization, in nano-technology, in epitaxial growth, in materials design, etc. An especially fruitful role for the method is in the journal publication process as the quality of the scientific literature can be enhanced. The focus herein is on the major role that lattice matching can play in the prevention of inadvertent duplicate publications of the same structure and in the determination of key cross-references.
Synthesis and Crystal Structure of C5H12NPO4H2
Abstract Synthesis and crystal structure are described for a new non- cento-symmetric organic-cation monophosphate, C5H10NH2·H2PO4. This compound is triclinic P1 with the following unit-cell parameters: a=6.2397(6), b=8.4191(7), c=8.8523(2) A, α=112.485(4), β=89.992(4), γ=90.104(7)°, V=429.37(5) A3, Z=2, and Dx=0.709 g cm−3. Crystal structure was solved with a final R value of 0.03 for 2347 independent reflections. The H2PO4 groups form, via strong hydrogen bonds, corrugated infinite chains (H2PO4)n−n spreading along the a direction. Between these chains coexist two crystallographically independent organic groups, which connect the chains with hydrogen bonds.
The southernmost Miocene penguin (Aves, Spheniscidae) from South America
MLP 00-III-5-1 is a distal end of a right tibiotarsus belonging to a fossil penguin. It comes from the Cerro Aguila Conglomerate (53°50’14.85”S, 67°47’29.78”W) near Rio Grande City, Tierra del Fuego, Argentina. These beds overly sediments referable to the Cabo Pena Formation, probably similar in age to that of the Middle Miocene Carmen Silva Formation. The fossil described here is the only fossil penguin from this unit and represents the southernmost record of a Neogene penguin in South America.