RESUMO
The title compound, C(24)H(22)O(4)S, was prepared by reaction between (2E)-3-(6-meth-oxy-2-naphth-yl)-1-(2-thien-yl)prop-2-en-1-one and ethyl acetoacetate. In the crystal, the cyclo-hexenone ring shows a distorted half-chair conformation. The length of the double bond in the cyclohexenone ring [1.343â (4)â Å] is normal.
RESUMO
The refinements described here for (NEt(4))[ZnI(4)] completely confirm the results previously obtained for the isostructural tetrabromocadmate at room temperature [Geselle & Fuess (1994). Acta Cryst. C50, 1582-1585]. Here again, isolated MX(4) (M = Zn and X = I) tetrahedra are accompanied by two cations in a 'swastika' conformation and a third in a virtually planar trans conformation. One of the former cations is particularly disordered.
RESUMO
Hydrothermally prepared ethylenediammonium beryllophosphate, (C(2)H(10)N(2))(0.5)[BePO(4)], is an analogue of aluminosilicate zeolite gismondine. A three-dimensional network of vertex-sharing BeO(4) and PO(4) tetrahedra [d(av)(Be-O) = 1.618 (3) A, d(av)(P-O) = 1.5246 (14) A and straight theta(av)(Be-O-P) = 139.8 degrees] encapsulates the disordered ethylenediammonium cations in an eight-ring channel system.
RESUMO
Nasicon-type trisodium discandium tris(arsenate), Na3Sc2(AsO4)3, contains a polyhedral network of vertex-sharing octahedral ScO6 and tetrahedral AsO4 units [d(av)(Sc-O) = 2.089 (2) A and d(av)(As-O) = 1.672 (2) A] encapsulating two types of Na+ species. The sodium site occupancies are similar to those of the equivalent species in beta-Na3Sc2(PO4)3.
RESUMO
The title compound, (NH(4))ZnPO(4)-HEX, is built up from a three-dimensional network of ZnO(4) and PO(4) tetrahedra [d(av)(Zn-O) = 1.9400 (7) A and d(av)(P-O) = 1.5396 (7) A], fused together via Zn-O-P links [straight theta(av) = 133.47 (4) degrees ]. An undisordered linear Zn-O-P bond occurs (all three atoms lie on a threefold axis). Extra-framework NH(4)(+) cations, which interact with the [ZnPO(4)](-) framework by hydrogen bonds, complete the crystal structure.
RESUMO
In bis(4-tolyl) sulfone, C(14)H(14)O(2)S (1), 2,5,4'-trimethyldiphenyl sulfone, C(15)H(16)O(2)S (2), and 4-chlorodiphenyl sulfone, C(12)H(9)ClO(2)S (3), the molecules are linked by soft C-H...O hydrogen bonds into three different types of one-dimensional aggregate: simple chains in (1), molecular ladders in (2) and chains of fused rings in (3). In each of 3,4-dimethyl-4'-chlorodiphenyl sulfone, C(14)H(13)ClO(2)S (4), and 2,5-dimethyldiphenyl sulfone, C(14)H(14)O(2)S (5), the C-H...O hydrogen bonds link the molecules into two different types of two-dimensional sheet, based on a (4,4) net in (4) and a (3,6) net in (5). The patterns of soft C-H...O hydrogen bonds in (1)-(5) are compared with those in other diaryl sulfones, mainly retrieved from the Cambridge Structural Database, whose substitution patterns preclude the formation of hard hydrogen bonds. Observed aggregation modes range from the formation of no C-H...O hydrogen bonds at all, via finite (zero-dimensional) arrays through one-, two- and three-dimensional systems.
RESUMO
In the title complex, [Cu(C(7)H(4)NO(3)S)(2)(C(2)H(7)NO)(2)], the Cu(II) centre lies on an inversion centre and exhibits octahedral coordination, with the two ethanolamine (Hea) and two saccharinate [sac; anionic 1,2-benzisothiazol-3(2H)-one 1,1-dioxide] ligands in a trans configuration. The bidentate Hea ligands bridge axial and equatorial positions and the sac anions occupy equatorial sites around the distorted octahedral copper(II) centre [Cu--O = 2.3263 (16), Cu--N(Hea) = 1.9923 (16) and Cu--N(sac) = 2.1776 (16) A].