In the reaction of pyrazine-2-carb-oxy-lic acid and stannic chloride in methanol, one equivalent of the carb-oxy-lic acid is methyl-ated at the 4-amino site and is also esterified, yielding the title salt, (C(7)H(9)N(2)O(2))[SnCl(4)(C(5)H(3)N(2)O(2))]. The Sn(IV) atom in the anion is N,O-chelated by a pyrazine-2-carboxyl-ate in a cis-SnNOCl(4) octa-hedral geometry.

The lithium-tin exchange, a metathesis reaction used for the preparation of organolithium reagents, proceeds by way of intermediate pentorgano "ate" complexes. Under suitable conditions these complexes can be observed spectroscopically. The formation constants of the complexes are dramatically increased by polar coordinating solvents such as THF and HMPA. The "ate" complexes have trigonal bipyr...

In the reaction of pyridine-2-carb-oxy-lic acid and stannic chloride in methanol, one equivalent of the carb-oxy-lic acid is protonated at the amino site and is also esterified, yielding the title salt, (C(7)H(8)NO(2))[SnCl(4)(C(6)H(4)NO(2))]. The Sn(IV) atom in the anion is N,O-chelated by a pyridine-2-carboxyl-ate in a cis-SnNOCl(4) octa-hedral geometry. The cation is linked to the anion by a...

In the title salt, (C(7)H(11)N(2))[SnCl(4)(C(10)H(6)NO(2))], the Sn(IV) atom is chelated by the N,O-bidentate carboxyl-ate ions and four chloride ions, showing a distorted octa-hedral SnNOCl(4) coordination. In the crystal, the cation and anion are linked by a pyridinium-carboxyl-ate N-H⋯O hydrogen bond.

In the title complex, (C(24)H(20)P)(2)[Sn(C(2)H(3)NO(2)S(3))(3)], the Sn(IV) atom is coordinated by three N-(methyl-sulfon-yl)dithio-carbimate bidentate ligands through the anionic S atoms in a slightly distorted octa-hedral coordination geometry. There is one half-mol-ecule in the asymmetric unit; the complex is located on a crystallographic twofold rotation axis passing through the cation and...

Between 1924 and 1947, Gino Severini decorated five churches in the Romand region of Switzerland with monumental religious wall paintings. This mural art played an important role Italian artist's career despite being mostly unknown not easily found. The painting methods materials these modern Swiss murals were characterized by combining historical archival research onsite visual scientific exam...

Abstract The influence of structural defects in spark plasma sintered BaSn1-xSbxO3 (BSSO, x = 0.00 and 0.08) ceramic samples on their electrical properties was investigated the temperature range 300 – 4 K. X-ray photoelectron spectroscopy (XPS) revealed presence point defects, primarily oxygen vacancies (VO) mixed oxidation states tin (Sn2+/Sn4+) both samples. As a result, undoped BSSO sample e...