01714nas a2200157   4500008004100000022001400041245007500055210006900130260007100199300001200270490000600282520110000288100002801388700003301416856010701449       2007                        eng d  a1528-748300aSolid-state structures of 4-carboxyphenylboronic acid and its hydrates0 aSolidstate structures of 4carboxyphenylboronic acid and its hydr  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAY  a944-9490 v73 a<p>Solid-state structures of 4-carboxyphenylboronic acid (1a) and its mono- and quarter-hydrates (1b and 1c, respectively) obtained by crystallization from different solvents, acetone, methanol, and 2-proponal, respectively, have been reported. In the anhydrous and monohydrate structures (1a and 1b), the H-atoms on the -B(OH)(2) functional group exist in syn-syn conformation, but syn-anti conformation was found in the quarter-hydrate structure. While 1a and 1b crystallize through interactions between -B(OH)(2) and -COOH groups (heteromeric), homomeric interactions of the functional groups (COOH center dot center dot center dot COOH and B(OH)(2)center dot center dot center dot B(OH)(2)) were observed in 1c. In addition, although similar interactions prevail in 1a and 1b, the latter crystallizes in a noncentrosymmetric space group Ccc2, registering itself as a unique structure with unusual catenation features with the aid of water molecules. However, 1a and 1c show many common features in the molecular arrangement in the crystal lattices with the formation of sheet structures.</p>1 aSeethaLekshmi, Nanappan1 aPedireddi, Venkateswara, Rao  uhttps://library.ncl.res.in/content/solid-state-structures-4-carboxyphenylboronic-acid-and-its-hydrates01747nas a2200169   4500008004100000022001400041245006600055210006500121260007100186300001400257490000600271520111100277100002801388700002801416700003301444856010001477       2007                        eng d  a1528-748300aSupramolecular architecture in some 4-halophenylboronic acids0 aSupramolecular architecture in some 4halophenylboronic acids  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcOCT  a1958-19630 v73 a<p>Crystal structures of 4-chloro- and 4-bromophenylboronic acids (1 and 2) and hydrates of 2 and 4-iodophenylboronic acid in two different forms (2a, 3a, and 3b), which were characterized by single-crystal X-ray diffraction methods, are reported. In structures I and 2, -B(OH)2 forms a syn-anti conformation, but it exists in syn-syn as well as anti-anti conformations in the hydrated structures 2a, 3a, and 3b. In all the structures, the molecules are held together by O-H center dot center dot center dot O interactions formed by -B(OH)2 groups. The C-H center dot center dot center dot X (X = Cl, Br, and I) interactions play an important role in crystal packing. In 2, Br center dot center dot center dot Br interactions are also observed. Interestingly, all the three hydrates form similar types of three-dimensional structures with the formation of channels, which are occupied by water molecules. The two hydrates of 4-iodophenylboronic acid (3a and 3b) are distinguishable on the basis of O center dot center dot center dot O short contacts, with an identical host lattice of the boronic acid.</p>1 aShimpi, Manishkumar, R.1 aSeethaLekshmi, Nanappan1 aPedireddi, Venkateswara, Rao  uhttps://library.ncl.res.in/content/supramolecular-architecture-some-4-halophenylboronic-acids-0