Ueber Diphenyl-o-Phenoxylen-Dihydroanthracen

Diphenyl (o-tolyl­amido)­phospho­nate

The asymmetric unit of the title compound, C(19)H(18)NO(3)P, contains two independent mol-ecules in which the P atoms are found in slightly distorted tetrahedral environments. In the crystal, pairs of inter-molecular N-H⋯O(P) hydrogen bonds form two independent centrosymmetric dimers.

Hippokrates Ueber die Krankheiten III

irrelevant. Chemistry and the relations between science, technology, and industry are well surveyed by Crosland and Cardwell respectively. Forbes's essay on mathematical cosmography is not a comprehensive account but the story (albeit interesting) of a few German cartographers. Compared with other recent collections of essays in the history of science, this volume parades no party line: witness...

Ueber Das Verschwinden Der Θ-functionen

Bis(diphenyl-p-tolyl­phosphane-κP)(2-hy­droxy-3,5,7-bromo­cyclo­hepta-2,4,6-trienonato-κ2 O,O′)copper(I)

The Cu(I) atom in the title compund, [Cu(C(7)H(2)Br(3)O(2))(C(19)H(17)P)(2)], is located on a twofold rotation axis; the 3,5,7-tribromo-tropolonate anion coordinates as a bidentate ligand with a bite angle of 76.42 (9)°. An intra-molecular C-H⋯O inter-action occurs. Within the crystal, extensive weak C-H⋯π inter-actions contribute to the herringbone pattern observed in the packing of the mol-ec...

trans-Bis(4,7-diphenyl-1,10-phenanthroline-κ2 N,N′)bis­(nitrato-κ2 O,O′)zinc(II)

The title compound, [Zn(NO(3))(2)(C(24)H(16)N(2))(2)], is a twofold axially symmetric coordination compound. Given that the Zn-O interactions [2.4926 (15) and 2.6673 (15) Å] can be considered as weakly bonding and the nitrate ions share the same C(2) axis of the Zn(dpp)(2) fragment (dpp is 4,7-diphenyl-1,10-phenanthroline), these anions belong to the coordination sphere of Zn(2+), leading to a ...