New pathway of diatom-mediated calcification and its impact on the biological pump.

Exploring metal-organic frameworks (MOFs) with specific structures is of great interest in both theoretical studies and practical applications. Herein, using a commercial achiral reagent (nitrilotriacetic acid [H3NTA]), a nanoporous MOF family, M(II)3(NTA)2 (M = Co, Fe, Mn; M-NTA), is discovered in the form of ultralong single-crystalline nanowires. It possesses an extraordinary structure with a very rare seven-coordination pattern (MO6N) for metal ions and an unprecedented chiral 3D transition metal-oxo framework constructed by edge-shared MO6N decahedra and MO6 octahedra. M-NTA shows excellent activity and selectivity in catalytic hydroboration of alkynes, and M−O in MO6 is the theoretical catalytic active site that is assisted by the possible structural steric effect between the activated MO6 and two adjacent MO6N polyhedra. These findings indicate that the M-NTA family not only enriches the structural diversity of MOF materials but that it also shows potential for catalytic organic conversion.