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A set of terms, definitions, and recommendations is provided for use in the classification of coordination polymers, networks, and metal-organic frameworks (MOFs). A hierarchical terminology is recommended in which the most general term is coordination polymer. Coordination networks are a subset of coordination polymers and MOFs a further subset of coordination networks. One of the criteria an MOF needs to fulfill is that it contains potential voids, but no physical measurements of porosity or other properties are demanded per se. The use of topology and topology descriptors to enhance the description of crystal structures of MOFs and 3D-coordination polymers is furthermore strongly recommended.

Coordination polymers (CPs) and metal-organic frameworks (MOFs) are among the most prolific research areas of inorganic chemistry and crystal engineering in the last 15 years, and yet it still seems that consensus is lacking about what they really are, or are not.

In this review, we highlight various preparative strategies and characterization methods for metal nanoparticles fabricated in porous metal-organic frameworks (MOFs) or porous coordination polymers (PCPs), and their applications in hydrogen storage and heterogeneous catalysis.

Novel supramolecular solids whose topologies depend on the counteranion, [Ag(C 14 H 20 N 6 )(NO 3 )] (1), [Ag(C 14 H 20 N 6 )]CF 3 SO 3 (2), and [Ag(C 14 H 20 N 6 )]ClO 4 (3), have been prepared by the self-assembly of AgX (X ) NO 3 -, CF 3 SO 3 -, and ClO 4 -) with ethylenediaminetetrapropionitrile (EDTPN, C 14 H 20 N 6 ). X-ray crystal structures indicate that compounds 1-3 are a 1-D coordination polymer, a 2-D layer, and a boxlike 2-D network, respectively. In 1, 2, and 3, the EDTPN ligand undergoes anion-dependent ligation to bind two, three, and five Ag(I) ions per EDTPN, respectively, by using the cyano groups in addition to two tertiary nitrogen atoms. The coordination numbers of Ag(I) ion in 1, 2, and 3, are five, four, and six, respectively. Interestingly, the CF 3 SO 3anion of 2 is exchanged with NO 3and ClO 4quantitatively in the crystalline state when the crystal of 2 is immersed in the aqueous solutions of NaNO 3 and NaClO 4 , respectively. The anion-exchange process is reversible between 1 and 2 but irreversible from 1 or 2 into 3. The supramolecular structural transformations among 1-3 are observed in the crystalline state, concomitant with the anion-exchange.