The solvatochromism of the novel dye 4-tert-butyl-2-(dicyanomethylene)-5-[4-(diethylamino)benzylidene]-D 3 -thiazoline (1) has been investigated in 26 solvents of different polarity. 1 exhibits a positive solvatochromism, its solvent-induced bathochromic UV/Vis absorption band shift ranges from n-hexane (l max ¼ 566 nm) to dimethyl sulfoxide (l max ¼ 640 nm). The molar absorption energy of the solvatochromic band shift of 1 can be well correlated with Kamlet-Taft's and Catala `n's solvent polarity scales. 1 is mainly sensitive to the solvent's dipolarity/polarizability (p* of SPP N term) rather than of its HBD (hydrogen-bond donating) or HBA (hydrogen-bond accepting) property. It is emphasized that the UV/Vis absorption band maximum of 1 in the strong HBD solvents acetic acid, 2,2,2-trifluoroethanol and 1,1,1,3,3,3-hexafluoropropan-2-ol fit well in the LSE (linear solvation energy) relationship with Kamlet and Taft's p* and Catala `n's SPP N scale, respectively, which makes this dye important as a dipolarity/polarizability indicator for various solid acids.

Sulphur-doped carbon was synthesized using a thiophene-based twin monomer. While tetra(thiophene-2-ylmethoxy)-silane can be converted into sulphur containing nanocomposites, which lead to microporous sulphur-doped carbon, it is possible to produce additional mesopores by the use of templates. Thus, a variety of sulphur-doped carbon materials with tailored pore texture are available.

Kamlet−Taft's α (hydrogen-bond acidity) and π* (dipolarity/polarizability) parameters of three different silica samples and a siliceous MCM-41 material determined in 17 various solvents are presented. Fe(phen)2(CN)2 [cis-dicyano-bis(1,10)phenanthrolineiron(II), (1)] and Michler's ketone [4,4‘-bis(N,N-dimethylamino)benzophenone, (2)] were used as solvatochromic surface polarity indicators. The UV/vis transmission spectra of the two surface polarity indicators 1 and 2 adsorbed on the silicas from the solvents were measured, and the absorption maxima were used to calculate the α and π* values of the silica surface. α of the silanols on the freely accessible surfaces decreases with increasing HBA (hydrogen-bond accepting) capacity of the solvent whereas the π* term of the solvent only marginally modifies the polarity of the external surface silanol groups. In the mesopores of MCM-41, the UV/vis shift of the solvatochromic dyes shows a different behavior as a function of solvent polarity than that on freely accessible silica surfaces. The dipolarity/polarizability of solvent molecules inside the pores affects significantly the solvatochromic shift of the dye in the pores. The specific polarity properties of the solvent/silica interface at freely accessible surfaces and inside the MCM-41 pores are discussed.

The production of metal‐based hybrid laminates, such as aluminum combined with thermoplastics like polyamide 6, requires a precise and purposeful design of the interface between the two components. The utilization of twin polymerization has been successfully examined and an improved adhesion behavior is shown. By utilizing the monomers 2,2′‐spirobi[4H‐1,3,2‐benzodioxasiline] and 2‐(3‐amino‐n‐propyl)‐2‐methyl‐4H‐1,3,2‐benzodioxasiline in a molar ratio of 15:85, medial tensile shear strength values of 12.9 ± 3.9 MPa are achieved in tests according to DIN EN 1465. Electron microscopic and atomic force microscopic investigations give further structural details of the hybrid material. Additionally, the results of nanoindentation and microscratch tests clearly demonstrate that the choice of an adhesion promoter depends on its chemical as well as its mechanical characteristics.

Organic–inorganic hybrid materials with urethane functionalities were obtained by simultaneous twin polymerization of twin prepolymers in combination with the twin monomer 2,2′-spirobi[4H-1,3,2-benzodioxasiline].