The Formation of a Unique 2D Isonicotinate Polymer Driven by Cu(II) Aerobic Oxidation.

The isolation and structural characterization of a unique Cu(II) isonicotinate (ina) material with 4-acetylpyridine (4-acpy) is provided. The formation of [Cu(ina)(4-acpy)] () is triggered by the Cu(II) aerobic oxidation of 4-acpy using O. This gradual formation of ina led to its restrained incorporation and hindered the full displacement of 4-acpy.

Controlling the Formation of Two Concomitant Polymorphs in Hg(II) Coordination Polymers.

Controlling the formation of the desired product in the appropriate crystalline form is the fundamental breakthrough of crystal engineering. On that basis, the preferential formation between polymorphic forms, which are referred to as different assemblies achieved by changing the disposition or arrangement of the forming units within the crystalline structure, is one of the most challenging topics still to be understood. Herein, we have observed the formation of two concomitant polymorphs with general formula {[Hg(Pip)(4,4'-bipy)]·DMF} (; Pip = piperonylic acid; 4,4'-bipy = 4,4'-bipyridine).

Tuning Photophysical Properties by -Functional Groups in Zn(II) and Cd(II) Complexes with Piperonylic Acid.

Aggregation between discrete molecules is an essential factor to prevent aggregation-caused quenching (ACQ). Indeed, functional groups capable of generating strong hydrogen bonds are likely to assemble and cause ACQ and photoinduced electron transfer processes. Thus, it is possible to compare absorption and emission properties by incorporating two ligands with a different toward intra- and intermolecular interactions that can induce a specific structural arrangement.

Steric and Electronic Effects on the Structure and Photophysical Properties of Hg(II) Complexes.

Since many factors influence the coordination around a metal center, steric and electronic effects of the ligands mainly determine the connectivity and, thus, the final arrangement. This is emphasized on Hg(II) centers, which have a zero point stabilization energy and, thus, a flexible coordination environment. Therefore, the unrestricted Hg(II) geometry facilitates the predominance of the ligands during the structural inception.

Influence of Aromatic Cations on the Structural Arrangement of Hg(II) Halides.

Understanding the structure and arrangement of hybrid metal halides and their contribution to the optoelectronic properties is, thus far, a challenging topic. In particular, new materials composed of d metal halides and pyridinium cations are still largely unexplored. Therefore, we report the synthesis and characterization of six Hg(II) salts built up from (HgCl) or (HgX) anions (X = Cl, Br, I) and 2,2'-bipyridium (2,2'-Hbipy), 2,2'-bipyridine-1,1'-diium (2,2'-Hbipy), or 1,10-phenantrolinium (1,10-Hphen) cations, using the same experimental conditions.

Isonicotinamide-Based Compounds: From Cocrystal to Polymer.

The reaction between [Cu(μ-OAc)(μ-Pip)(MeOH)] () (OAc = acetate; Pip = 1,3-benzodioxole-5-carboxylate) and isonicotinamide (Isn) in MeOH as solvent yielded two mixture pairs of three compounds: {(HPip)(Isn) (), [Cu(Pip)(Isn)] ()} and {(), {[Cu(Pip)(OAc)(μ-Isn)(Isn)(μ-OCH)(MeOH)]·2MeOH} ()}. Modifying the reaction conditions (t, T, molar ratio), and have been successfully isolated, whereas and had to be mechanically separated. The recrystallization of in pentanol yielded single crystals of compound [Cu(Pip)(Isn)]·CHOH ().