Read More
Date: 6-1-2019
1135
Date: 28-12-2018
964
Date: 1-4-2019
1385
|
Aluminium analogue
No Al analogue of B2H6 exists, although monomeric AlH3 has been isolated at low temperature in a matrix. In the solid state, X-ray and neutron diffraction data have shown that aluminium hydride consists of a three-dimensional network in which each Al centre is octahedrally sited, being involved in six Al_H_Al 3c-2e interactions. Digallane, Ga2H6, was fully characterized in the early 1990s, and electron diffraction data show it to be structurally similar to B2H6 (Ga_Hterm = 152 pm, Ga_Hbridge = 171 pm, Ga_H_Ga = 988). The existence of neutral binary hydrides of In and Tl has not been confirmed. The hydrides of the group 13 elements are extremely air- and moisture-sensitive, and handling themrequires the use of high vacuumtechniques with all-glass apparatus.
|
|
كيف تساهم الأطعمة فائقة المعالجة في تفاقم مرض يصيب الأمعاء؟
|
|
|
|
|
مشروع ضخم لإنتاج الهيدروجين الأخضر يواجه تأخيرًا جديدًا
|
|
|
|
|
المجمع العلمي يختتم دورته القرآنية في فن الصوت والنغم بالطريقة المصرية
|
|
|