1
|
Semiconducting and Metallic States in Conducting Organic Low-dimensional Materials. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19910951124] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
2
|
A third blind test of crystal structure prediction. ACTA CRYSTALLOGRAPHICA SECTION B: STRUCTURAL SCIENCE 2005; 61:511-27. [PMID: 16186652 DOI: 10.1107/s0108768105016563] [Citation(s) in RCA: 241] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2004] [Accepted: 05/24/2005] [Indexed: 11/10/2022]
Abstract
Following the interest generated by two previous blind tests of crystal structure prediction (CSP1999 and CSP2001), a third such collaborative project (CSP2004) was hosted by the Cambridge Crystallographic Data Centre. A range of methodologies used in searching for and ranking the likelihood of predicted crystal structures is represented amongst the 18 participating research groups, although most are based on the global minimization of the lattice energy. Initially the participants were given molecular diagrams of three molecules and asked to submit three predictions for the most likely crystal structure of each. Unlike earlier blind tests, no restriction was placed on the possible space group of the target crystal structures. Furthermore, Z′ = 2 structures were allowed. Part-way through the test, a partial structure report was discovered for one of the molecules, which could no longer be considered a blind test. Hence, a second molecule from the same category (small, rigid with common atom types) was offered to the participants as a replacement. Success rates within the three submitted predictions were lower than in the previous tests – there was only one successful prediction for any of the three `blind' molecules. For the `simplest' rigid molecule, this lack of success is partly due to the observed structure crystallizing with two molecules in the asymmetric unit. As in the 2001 blind test, there was no success in predicting the structure of the flexible molecule. The results highlight the necessity for better energy models, capable of simultaneously describing conformational and packing energies with high accuracy. There is also a need for improvements in search procedures for crystals with more than one independent molecule, as well as for molecules with conformational flexibility. These are necessary requirements for the prediction of possible thermodynamically favoured polymorphs. Which of these are actually realised is also influenced by as yet insufficiently understood processes of nucleation and crystal growth.
Collapse
|
3
|
|
4
|
Forces, Frustration and Fun - A View on the Dimensions of the Packing Problem. Acta Crystallogr A 2000. [DOI: 10.1107/s0108767300023163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
5
|
Direct observation of Coulomb interactions in highly conducting. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:4891-4894. [PMID: 10008985 DOI: 10.1103/physrevb.48.4891] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
6
|
|
7
|
X-ray scattering evidence for dimerization (4 kF) and spin-Peierls distortion (2 kF) in silver salts of dicyanoquinodiimine (2,5 MR-DCNQI )2 Ag (R = CH3, Cl or Br, M = CH3). ACTA ACUST UNITED AC 1988. [DOI: 10.1051/jphys:0198800490110192500] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
|