The title compound, poly[bis-(μ(3)-4-acetamido-propane-sulfon-ato)-calcium], [Ca(C(5)H(10)NO(4)S)(2)](n), is a triclinic polymorph of the previously reported monoclinic structure [Toffoli et al. (1988 ▶). Acta Cryst. C44, 1493-1494]. The triclinic modification was found to have an all-trans configuration of the acetamido-propane chain, in contrast with the monoclinic polymorph which shows an an...

The crystal structures of ds-(«-Bu4N)2[ReBr4(NCS)2] (1) (triclinic, space group Pi, a = 11.475(6), b = 20.096(16), c = 22.144(11) A, a = 110.56(6), ß = 92.97(5), 7 = 99.77(7)°, Z = 4), m-(n-Bu4NMReBr4(NCSe)i] (2) (triclinic, space group PI, a = 11.527(3), b = 20.237(7), c = 22.07(2) Ä, a = 110.05(4), ß = 93.86(6), 7 = 99.49(4)°, Z = 4) and cis-{nBu4N)2[ReBr4(NCS)(NCSe)] (3) (triclinic, space gr...

Optical second harmonic generation is a second-order nonlinear process that combines two photons of given frequency into third photon at twice the frequency. Due to symmetry constraints, it widely used as sensitive probe detect broken inversion and local polar order. Analytical modeling electric-dipole SHG response essential extract fundamental properties materials from experiments. However, co...

Fiber orientation tensors are established descriptors of fiber states in (thermo-)mechanical material models for fiber-reinforced composites. In this paper, the variety fourth-order is analyzed and specified by parameterizations admissible parameter ranges. The combination ranges allows studies on mechanical response different architectures. Linear invariant decomposition with focus index symme...

(EDT-TTF-CONH2)6[Re6Se8(CN)6] is a molecular solid with R3 space group symmetry and has the remarkable feature of exhibiting hybrid donor layers with a kagome topology which sustain metallic conductivity. We report a detailed study of the structural evolution of the system as a function of temperature and pressure. This rhombohedral phase is maintained on cooling down to 220 K or up to 0.7 GPa ...

Experimental studies show that K replacement of Na in triclinic plagioclase under hydrothermal conditions results directly in triclinic microcline without forming intermediate monoclinic orthoclase. These experiments bring laboratory and field evidence into agreement for the K-metasomatic origin of granites which contain exclusively microcline as the potash feldspar. Such replacements of a more...

Lotharmeyerite, calcium bis-(zinc/manganese) bis-(arsenate) bis-(hydroxide/hydrate), Ca(Zn,Mn(3+))(2)(AsO(4))(2)(H(2)O,OH)(2), is a member of the natrochalcite group of minerals, which are characterized by the general formula AM(2)(XO(4))(2)(H(2)O,OH)(2), where A may be occupied by Pb(2+), Ca(2+), Na(+), and Bi(3+), M by Fe(3+), Mn(3+), Cu(2+), Zn(2+), Co(2+), Ni(2+), Al(3+), and Mg(2+), and X ...