Dr. Ahmed Mohammed Abu-Dief Mohammed

Prof. Assistant - Assistant professor of Inorganic and Physical Chemistry

Faculty of science

Address: Behind hospital of Sohag University - Ali Ebn Abi Taleb Street


2019-01-07 09:29:12 | 0 | Transition elements
طيف انتقال الشحنة
اشرح ظاهرة طيف انتقال الشحنة كمصدر للون فى اعناصر الانتقالية مع ذكر أمثلة؟ Read more

2018-12-30 16:35:25 | 0 | Organometallic Chemistry
Stability of Organometallic compounds2
Put true or false Cyclopentadiene is more stable than cyclopentadienyl in their organometallic compounds ( ) Read more

2018-12-30 16:03:10 | 0 | Organometallic Chemistry
metal-bound arene ring
WHICH OF THE FOLLOWING STATEMENTS IS CORRECT ABOUT THE METAL-BOUND ARENE RING IN (Η6-C6H6)CR(CO)3? (Η6-C6H6)CR(CO)3? (Η6-C6H6)CR(CO)3? (Η6-C6H6)CR(CO)3? (Η6-C6H6)CR(CO)3? (Η6-C6H6)CR(CO)3? (Η6-C6H6)CR(CO)3? (Η6-C6H6)CR(CO)3? (Η6-C6H6)CR(CO)3? a- The metal-bound ring is more susceptible to attack by electrophiles than free C6H6 b- The metal-bound ring is more susceptible to attack by nucleophiles than free C6H6 c- The metal-bound ring readily undergoes addition reactions, whereas free ... Read more

2018-12-28 14:19:15 | 0 | Advanced coordination chemistry
Δ0 changes 
Describe how Δ0 changes withe change of the oxidation state of central metal ion in complexes? Read more

2018-12-28 10:07:33 | 0 | Advanced coordination chemistry
Stability of complexes
How chelation participates on the stability of complexes? Read more

2018-12-21 15:05:00 | 1 | Organometallic Chemistry
What does hapticity refer to in organometallic chemistry? A - The chemical potential of the +3 oxidation state of the metal center vs the +1 oxidation state. B - The number of electrons donated to the metal center by a ligand. C- The number of ligands surrounding a metal center. D- The reduction potential of the transition metal center in ... Read more

2018-12-21 13:49:06 | 1 | Organometallic Chemistry
NO ligand
The cationic model of NO is isoelectronic with CO in formation of …………… [a- σ bond b- π donation c- both a and b d- none] with the metal. Read more

2018-12-20 15:34:54 | 0 | Organometallic Chemistry
Easy oxidation
Which of the following complexes show easy oxidation? a) (η5-C5H5)2Fe b) (η5-C5H5)2Ru c) (η5-C5H5)2Co d) (η5-C5H5)2Co+ Read more

2018-12-20 14:54:38 | 0 | Organometallic Chemistry
18- electron rule2
Which of the following is the neutral complex which follows the 18- electron rule? a) (η5-C5H5)Fe(CO)2 b) (η5-C5H5)2Mo(CO)3 c) (η5-C5H5)2Co d) (η5-C5H5)2Re(η6-C6H6) Read more

2018-12-20 14:43:09 | 1 | Organometallic Chemistry
Oxidation state 2
* What is the oxidation state of molybdenum in [η7-tropylium) Mo(CO)3]+? a) +2 b) +1 c) 0 d) -1 Read more