10.1021/cg901161z.s003 Avijit Kumar Paul Avijit Kumar Paul Srinivasan Natarajan Srinivasan Natarajan Amine-Templated Aluminoborates Exhibiting Graphite and Diamond Nets American Chemical Society 2010 amine templated aluminoborates IR compounds II B 5O cyclic pentaborate units nodes form 5H MAS NMR studies III aluminoborate structures Al 2O H 3BO pyridine H 2O framework structures IV amine molecules 6H graphite structure Diamond NetsA solvothermal reaction 2010-02-03 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Amine_Templated_Aluminoborates_Exhibiting_Graphite_and_Diamond_Nets/2795137 A solvothermal reaction of Al<sub>2</sub>O<sub>3</sub>, H<sub>3</sub>BO<sub>3</sub>, pyridine, and H<sub>2</sub>O at 180 °C/7 days in the presence of organic amine molecules gave rise to four new aluminoborates, [(C<sub>6</sub>H<sub>18</sub>N<sub>2</sub>)(AlB<sub>6</sub>O<sub>13</sub>H<sub>3</sub>)], <b>I</b>; [(C<sub>5</sub>H<sub>16</sub>N<sub>2</sub>)(AlB<sub>5</sub>O<sub>10</sub>)]·2H<sub>2</sub>O, <b>II</b>; [(C<sub>5</sub>H<sub>16</sub>N<sub>2</sub>)(AlB<sub>5</sub>O<sub>10</sub>)], <b>III</b>; and [(C<sub>5</sub>H<sub>17</sub>N<sub>3</sub>)(AlB<sub>5</sub>O<sub>10</sub>)]·H<sub>2</sub>O, <b>IV</b>, with two- and three-dimensional structures. All the structures have been formed by the connectivity involving Al<sup>3+</sup> ions and [B<sub>5</sub>O<sub>10</sub>] cyclic pentaborate units. In <b>I</b>, the 3-connected trigonal nodes form a layer that resembles a graphite structure has been observed. The compounds <b>II</b>, <b>III</b>, and <b>IV,</b> have 4-connected nodes that forms a diamond related three-dimensional structure. The formation of solvatomorphs in <b>II</b> and <b>III</b> is noteworthy and has been observed first time in a family of amine templated aluminoborates. A comparison of the various aluminoborate structures reveals subtle relationships between the organic amines (length of the amines) and the final framework structures. The compounds have been characterized using a variety of techniques including IR, second-order optical behavior, and MAS NMR studies.