Crystal-to-Crystal Transformation from a Weak Hydrogen-Bonded Two-Dimensional Network Structure to a Two-Dimensional Coordination Polymer on Heating

Single crystal to single crystal transformation of a new mercury(II) coordination polymer with ligand 1,4-bis(2-pyridyl)-2,3-diaza-1,3-butadiene (bpdb), [Hg2(µ-bpdb)I4] (1α) to [Hg2(µ-bpdb)(µ-I)2I2]n (1β), has been reported and structures of 1α and 1β were determined by X-ray crystallography. The thermal stability of compounds 1α and 1βwere studied by thermal gravimetric (TG) and differential thermal analyses (DTA). Powder X-ray diffraction experiments showed that the phase transitions described for single crystals also occur in macroscopic powder samples and lead to monophasic products and the crystal-to-crystal transformation described is not reversible

Solid-State Structural Transformations of Two Ag^I Supramolecular Polymorphs to Another Polymer upon Absorption of HNO₃ Vapors

Solid-state structural transformation of two polymorphic forms of [Ag­(8-HqH)­(8-Hq)]n (1α and 1β, where 8-HqH = 8-hydroxyquinoline and 8-Hq– = 8-hydroxyquinolate) to {[Ag­(8-HqH)2]­NO3}n (2) has been observed upon solid–gas reaction of compounds 1α and 1β with HNO3 vapors. Solid–gas reaction of compound 2 with hydrated vapors of NH3 results in the formation of only the 1β polymorph, while solid–solid reaction of compound 2 with KOH results in the formation of a 1α and 1β mixture with chiral and achiral space groups of P212121 and Pbcn, respectively

New Reversible Crystal-to-Crystal Conversion of a Mixed-Ligand Lead(II) Coordination Polymer by De- and Rehydration

A reversible crystal-to-crystal transformation of a new 2D lead(II) coordination polymer with the ligand 4-pyridinecarboxylic acid (4-Hpyc), [Pb(4-pyc)(Br)(H2O)]n (1) to [Pb(4-pyc)(Br)]n (2) by de- and rehydration, has been observed, and the structures of 1 and 2 have been determined by single-crystal X-ray diffraction. The thermal stabilities of compounds 1 and 2 were studied by thermal gravimetric and differential thermal analyses. Powder X-ray diffraction experiments showed that the structural transformation occurs in the batch powder samples and leads to monophasic products

One-Dimensional Corrugated Tape Ag^I Coordination Polymers Constructed of Ag−C Bonds

Three one-dimensional (1D) polymers assembled of Ag−C bonds, [Ag2(μ3-L)2(MeCN)]n (1−3) [L = 4,4,4-trifluoro-1-phenyl-1,3-butandione (HTFPB) (1), 4,4,4-trifluoro-1-naphthyl-1,3-butandionate (HTFNB) (2), and 4,4,4-trifluoro-1-thiophen-1,3-butandione (HTFTB) (3)] have been synthesized and characterized by elemental analysis, IR, and 1H NMR spectroscopy. The thermal stability of compounds 1−3 were studied by thermal gravimetric and differential thermal analyses. The single-crystal X-ray structures of compounds 1 and 2 show two types of AgI ions with coordination numbers of five and four. The Ag atoms contain strong AgI−Cmethine bonds and thus produce 1D corrugated tape coordination polymers. Furthermore, the ligands and complexes 1−3 are luminescent in the solid state with emission maxima in the visible light region (λmax = 470 nm). The results of studies the stoichiometry and formation of complexes 1−3 in acetonitrile solution were found to be in support of their solid-state stoichiometries

One-Dimensional Corrugated Tape Ag^I Coordination Polymers Constructed of Ag−C Bonds

Three one-dimensional (1D) polymers assembled of Ag−C bonds, [Ag2(μ3-L)2(MeCN)]n (1−3) [L = 4,4,4-trifluoro-1-phenyl-1,3-butandione (HTFPB) (1), 4,4,4-trifluoro-1-naphthyl-1,3-butandionate (HTFNB) (2), and 4,4,4-trifluoro-1-thiophen-1,3-butandione (HTFTB) (3)] have been synthesized and characterized by elemental analysis, IR, and 1H NMR spectroscopy. The thermal stability of compounds 1−3 were studied by thermal gravimetric and differential thermal analyses. The single-crystal X-ray structures of compounds 1 and 2 show two types of AgI ions with coordination numbers of five and four. The Ag atoms contain strong AgI−Cmethine bonds and thus produce 1D corrugated tape coordination polymers. Furthermore, the ligands and complexes 1−3 are luminescent in the solid state with emission maxima in the visible light region (λmax = 470 nm). The results of studies the stoichiometry and formation of complexes 1−3 in acetonitrile solution were found to be in support of their solid-state stoichiometries