Sustainable polycarbonate adhesives for dry and aqueous conditions with thermoresponsive properties

Pressure sensitive adhesives are ubiquitous in commodity products such as tapes, bandages, labels, packaging, and insulation. With single use plastics comprising almost half of yearly plastic production, it is essential that the design, synthesis, and decomposition products of future materials, including polymer adhesives, are within the context of a healthy ecosystem along with comparable or superior performance to conventional materials. Here we show a series of sustainable polymeric adhesives, with an eco-design, that perform in both dry and wet environments. The terpolymerization of propylene oxide, glycidyl butyrate, and CO2, catalyzed by a cobalt salen complex bearing a quaternary ammonium salt, yields the poly(propylene-co-glycidyl butyrate carbonate)s (PPGBC)s. This polymeric adhesive system, composed of environmentally benign building blocks, implements carbon dioxide sequestration techniques, poses minimal environmental hazards, exhibits varied peel strengths from scotch tape to hot-melt wood-glue, and adheres to metal, glass, wood, and Teflon® surfaces.Published versio

(4S,5S)-2,2-Dimethyl-4,5-bis­(3-methyl-2-thioxo-2,3-dihydro-1H-imidazol-1-yl­meth­yl)-1,3-dioxolane

In the chiral title compound, C15H22N4O2S2, there are two mol­ecules in the asymmetric unit with distinctly different conformations, as quanti­fied by torsion angles. The dihedral angles between the thio­imidazole rings are 81.59 (5) and 67.04 (4)°. One mol­ecule exhibits local twofold rotation symmetry, while the other displays no local symmetry. Inter­molecular C—H⋯O and C—H⋯S inter­actions are observed

Piperazinediium tetra­chloridozincate(II)

In the title compound, (C4H12N2)[ZnCl4], the Zn atom adopts a slightly distorted tetra­hedral geometry. In the crystal, the dication and dianion inter­act by way of N—H⋯Cl and N—H⋯(Cl,Cl) hydrogen bonds to result in a layered network propagating in (010). The hydrogen-bonding network is unbalanced, with three Cl atoms accepting two hydrogen bonds each and one Cl atom not accepting any hydrogen bonds: the latter shows the shortest Zn—Cl bond length. The crystal studied was found to be an inversion twin

(1S,2S,4R)-7-tert-But­oxy­bicyclo­[2.2.1]hept-5-en-2-yl (2S)-2-(6-meth­oxy­naphthalen-2-yl)propano­ate

In the title mol­ecule, C25H30O4, the napthalene ring system is slightly bowed, with a dihedral angle of 4.37 (13)° between the two benzene rings

Tris(ethyl carbazate-κ2 N,O)nickel(II) dinitrate

The asymmetric unit of the title compound, [Ni(C3H8N2O2)3](NO3)2, contains two independent cations, each built up around a fac-NiN3O3 octa­hedron, and four nitrate anions. Numerous cation-to-anion N—H⋯O hydrogen bonds, some of which are bifurcated, help to establish the packing

Diaqua­tetra­chloridotin(IV)–diglyme (1/2)

In the title 1:2 adduct, [SnCl4(H2O)2]·2C6H14O3, the SnIV atom (site symmetry 2) adopts a cis-SnO2Cl4 octa­hedral geometry. In the crystal structure, O—H⋯O hydrogen bonds lead to associations of one metal complex and two diglyme mol­ecules

Redetermination of phenyl­hydrazinium chloride

In the redetermined structure [Koo (1965 ▶). Bull. Chem. Soc. Jpn, 38, 286] of the title compound, C6H9N2 +·Cl−, the H atoms have been located and the hydrogen-bonding scheme established. A series of N—H⋯Cl and N—H⋯N hydrogen bonds leads to a layered network parallel to the (010) plane

Ethyl 4-(2,4-dichloro­phen­yl)-6-(6-meth­oxy-2-naphth­yl)-2-oxocyclo­hex-3-ene-1-carboxyl­ate

In the title compound, C26H22Cl2O4, the cyclo­hexenone ring adopts an approximate half-chair conformation, with two C atoms displaced by −0.485 (6) and 0.218 (6) Å from the plane of the other four ring atoms. The dihedral angles between its four almost coplanar [maximum deviation = 0.006 (2) Å] atoms and the benzene and naphthalene ring systems are 59.26 (13) and 79.94 (9)°, respectively. The dihedral angle between the aromatic rings systems is 77.14 (7)°. A short intra­molecular C—H⋯Cl contact generates an S(6) ring. In the crystal, mol­ecules are linked by C—H⋯O and C—H⋯Cl inter­actions to generate a three-dimensional network

(2E)-1-(3-Bromo­phen­yl)-3-(6-meth­oxy-2-naphth­yl)prop-2-en-1-one

In the title compound, C20H15BrO2, the prop-2-en-1-one fragment is substanti­ally twisted [C—C—C—O = 23.0 (11)°]. The dihedral angle between the benzene and naphthalene rings is 44.28 (13)°. The only possible directional inter­actions in the crystal are weak C—H⋯π contacts, which generate (001) sheets

Crystal structure of bis-[3-meth-oxy-17β-estra-1,3,5(10)-trien-17-yl] oxalate.

In the title compound, C40H50O6, a symmetrical steroid oxalate diester, the dihedral angle between the CO2 planes of the oxalate linker is 61.5 (5)° and the C-C bond length is 1.513 (6) Å. The steroid B, C and D rings adopt half-chair, chair and envelope conformations, respectively, in both halves of the mol-ecule, which adopts an overall shallow V-shaped conformation. In the crystal, mol-ecules are linked by weak C-H⋯O inter-actions, forming a three-dimensional network