ahmedabudief

Dr. Ahmed Mohammed Abu-Dief Mohammed

Assistant Professor - Assistant professor of Inorganic and Physical Chemistry

Faculty of science

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

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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
hapticity
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

2018-12-20 13:51:27 | 1 | Organometallic Chemistry
Oxidation state
1. What are oxidation states of metal ion in following complexes? I. PdCl2 II. Pd(PPh3)4 III. Pd(OAc)2 IV. ArPdBr where Ar is aryl a) 2, 4, 2, 2 b) 2, 0, 2, 1 c) 2, 0, 2, 2 d) 0, 0, 0, 2 Read more

2018-12-20 11:38:41 | 1 | Organometallic Chemistry
Stability of Organometallic compounds
What valence electron count is usually associated with stability when thinking about transition metal organometallic complexes? A 12 ------------------------- B 14 ------------------------- C 16 ------------------------- D 18 Read more

2018-12-20 11:29:01 | 1 | Organometallic Chemistry
Alkyl group
How many electrons do alkyl groups typically contribute to the valence electron count? A 0 ------------------------- B 1 ------------------------- C 2 ------------------------- D 3 Read more