1. Professor of Inorganic Chemistry, Dept. of Chemistry, College of Science, Al Imam Mohammad Ibn Saud Islamic Univ., P.O. Box 90950, Riyadh, Saudi Arabia 11623; Professor of Inorganic Chemistry, Dept. of Chemistry, Faculty of Science, Benha Univ., Benha, Egypt (corresponding author).
2. Professor of Organic Chemistry, Dept. of Chemistry, College of Science, Al Imam Mohammad Ibn Saud Islamic Univ., P.O. Box 90950, Riyadh, Saudi Arabia 11623.
3. Associate Professor of Organic Chemistry, Dept. of Chemistry, College of Science, Al Imam Mohammad Ibn Saud Islamic Univ., P.O. Box 90950, Riyadh, Saudi Arabia 11623.