Electrostatic calculations estimated the energy of hypothetical ion clustering in intermediate plagioclase feldspars. The calculated energy appears too great to allow segregation of Ca and Na atoms into domains upon annealing without a corresponding movement of A1 and Si from an original disordered structure. The calculated energy may be sufficiently small that Ca and Na atoms can disorder part...

The mononuclear title compound, [Ti(C(5)H(10)NO(2))(4)], is a rare example of an eight-coordinate Ti(IV) compound in which all donor atoms are O atoms. The coordination geometry around Ti(IV) is pseudo-dodeca-hedral and the O-C-O angles of the carbamate ligands are slightly compressed [range 115.3 (2)-116.7 (2)°], apparently on account of the high coordination number. One ethyl group is disorde...

The crystal structure of the title compound, C(6)H(16)OSi·0.5H(2)O, reveals an asymmetric unit containing two mol-ecules of the silanol and a single water mol-ecule. There is evidence of hydrogen bonding between the three mol-ecules in the asymmetric unit. The H atoms of the silanol OH groups and the water H atoms are each disordered equally over two positions.

In the title compound, C(10)H(9)IO, the asymmetric unit contains two mol-ecules, in which the iodo-bearing six-membered rings adopt envelope conformations [displacements of the flap atoms = 0.419 (3) and 0.431 (3) Å]. In both mol-ecules, the I atoms are disordered over two set of sites in 0.54 (4):0.46 (4) and 0.71 (3):0.29 (3) ratios. In the crystal, the packing features a weak C-H⋯π inter-act...

At 223 (2) K, the complexed rings in the iron(II) complex cation of the title salt, [Fe(C(5)H(5))(C(15)H(20)O(4))]PF(6), are almost parallel [dihedral angle between planes = 4.10 (14)°]. Among the C atoms of the complexed arene ring, the quaternary C atom is located at the longest distance from the Fe atom. The F atoms of the PF(6) (-) anion were found to be equally disordered over two sites.

In the title chromium silanethiol-ate, [Cr(C(12)H(27)O(3)SSi)(2)(C(7)H(9)N)(2)]·C(7)H(8), the Cr(II) atom is coordinated by two S and two N atoms in a distorted square-planar geometrical arrangement. The mononuclear mol-ecule lies on a twofold axis that passes through the pyridine N atoms. The toluene solvent mol-ecule is equally disordered about a twofold axis.

In the title hydrate, C(4)H(7)N(3)O(2)·H(2)O, all the non-H atoms lie on a crystallographic mirror plane. The H atoms of both methyl groups are disordered over two sets of sites. In the crystal, N-H⋯O(w) and O(w)-H⋯O(k) (w = water and k = ketone) hydrogen bonds link the components into (010) sheets.

In the title compound, [Bi(C(20)H(23)N)(CF(3)SO(3))], the Bi(III) ion shows a distorted pseudo-trigonal-bipyramidal geometry, with two C atoms and a lone electron pair of the Bi atom in equatorial positions and the N and O atoms at the apical positions. The cyclo-hexyl group is disordered over two orientations with site-occupancy factors of 0.600 (14) and 0.400 (14).

2.3 CAD model and photograph of external cavity diode laser design. A ther-moelectric element between the enclosure and the plate to which the ECDL components are mounted is used to adjust the temperature of the plate.. v 2.26 Evaporation sequence for producing nearly pure BEC in the hybrid opti-3.1 Sample of sequencer code, generated C code, and corresponding timeline.. 46 3.2 Another sample o...