#Rolleiflex 2.8 f white face pro
Data reduction: CrysAlis PRO (Rigaku OD, 2015) for compound1 CrysAlis PRO (Rigaku OD, 2018) for compound2, compound3, compound4, compound6, compound7, compound8, compound9, compound11 CrysAlis PRO (Rigaku OD, 2021) for compound5, compound10. Cell refinement: CrysAlis PRO (Rigaku OD, 2015) for compound1 CrysAlis PRO (Rigaku OD, 2018) for compound2, compound3, compound4, compound6, compound7, compound8, compound9, compound11 CrysAlis PRO (Rigaku OD, 2021) for compound5, compound10. The compounds of 4-hydroxybenzoic acid, C 7H 6O 3, described here are: poly, n, 1, poly, n, 2, poly, n, 3, catena-poly-di-μ-aqua]], n, 11.Ĭontains datablocks compound1, compound2, compound3, compound4, compound5, compound6, compound7, compound8, compound9, compound10, compound11, globalĬCDC references: 2085625 2085624 2085623 2085622 2085621 2085620 2085619 2085618 2085617 2085616 2085615ĭata collection: CrysAlis PRO (Rigaku OD, 2015) for compound1 CrysAlis PRO (Rigaku OD, 2018) for compound2, compound3, compound4, compound6, compound7, compound8, compound9, compound11 CrysAlis PRO (Rigaku OD, 2021) for compound5, compound10. Hydrogen bonding plays a key role in the structure of most compounds and a short strong hydrogen bond (SSHB) is observed in two of the networks. The hydroxybenzoate units are usually both parallel and antiparallel with their immediate neighbours, with packing that can be edge-to-face, face-to-face or a mixture of the two. Close packing of these units seems to be a dominant influence in determining the overall structure. A common feature of the structures is their layered arrangement: alternating hydrophilic layers made up of closely packed metal–oxygen polyhedra separated by the hydrophobic component of the hydroxybenzoate linking units. Although H 2hba is a relatively simple organic molecule, it displays remarkable coordinative flexibility, forming ionic solids containing the uncharged molecule, the monoanion Hhba − or the dianion hba 2−.
Whilst the salts might be expected to have similar atomic arrangements, there are significant differences in their structures. Their investigation of the alkali metal salts of 4-hydroxybenzoic acid (H 2hba) yielded nine new compounds and their structures are described in this article. As part of an educational exercise designed to introduce school students to the technique of single-crystal X-ray diffraction and enhance their understanding of primary and secondary bonding, a group of nine secondary school students was given the opportunity to prepare new compounds and to solve and refine data collected on the crystalline materials they had prepared.
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