From H<sub>12</sub>C<sub>4</sub>N<sub>2</sub>CdI<sub>4</sub> to H<sub>11</sub>C<sub>4</sub>N<sub>2</sub>CdI<sub>3</sub>: a highly polarizable CdNI<sub>3</sub> tetrahedron induced a sharp enhancement of second harmonic generation response and birefringence
Chemical science