Dear Dr ajmal

as Dr David said , if the Pi-acceptor  ligand such as CN_ , CO or other ligands such these can be binding it would make a metal-Ligand charge transfer and in this case according to MO Theory it will happen. 

You can Follow the inorganic books to find the mechanism.

Best Regards

Parisa 

From the classical point of view, it will be correct to say it is not possible for d-orbital to be involved in bonding. However, if we consider the molecular orbital theory, you will see that if for example, you have Zn in an octahedral environment with say, a pi-acceptor ligand, I think it is possible for the t2g orbitals which are essentially non-bonding to donate electrons to the pi-acceptor ligand. This is very common in organometallics. CO and CHCH are typical examples of ligands with empty pi* (antibonding) orbital that can accept this electron.

However, one should also consider the stability of the Zn2+ as well as the synergy (pi symmetry) that must exist for this to happen. I hope this helps

Dear Dr ajmal

as Dr David said , if the Pi-acceptor  ligand such as CN_ , CO or other ligands such these can be binding it would make a metal-Ligand charge transfer and in this case according to MO Theory it will happen. 

You can Follow the inorganic books to find the mechanism.

Best Regards

Parisa 

Thanks for your valuable response. I am confused that if Zn or Cd attached with Oxygen and F atoms as legands then is it possible that metal-Ligand charge transfer take place? Is there any reference book or paper that clear show mechanism of this charge transfer? As Zn/Cd has d10 so how t2g can give electrons to ligands ? Is this possible that Zn/Cd make bonding with non bonding orbitals of ligands like d-pi interaction? Please can you tell me more clear description about this? I will be very thankful.

Dear Ajmal

If theligand af F , you mean it is pi donor not pi acceptor and then the charge transfer should be  Ligand to metal charge transfer which is different, please read the MO theory and if you need I will send you the book in this matter!

Thank you dear Parisa Ziarati,

I am really interested to know the ligand with pi donor (O, halogens) attached with d10 metals (Zn and Cadmium). So i want to know that how charge transfer takes place in such systems and which kind of bonding exits? It will be great favor if you send me any reference book regarding this matter.

Mrs/Miss/Mr. Ajmal,

Talking about the nature of the chemical bonds, there should be strongly distinguished between the nature of the interactions in (pure) inorganics which are purely ionic, metallic or covalent ones; and organics with the well known concepts of s,p, etc. bonding types. On the contrary, in metal-organics there are several types interactions such as for example: ligand–to–metal, metal–to–ligand, sigma bond–to–sigma bond, metal–centered, ligand–centered charge transfers, M+...p-interactions, etc.

Due to research effort over decades mainly concentrated on purely inorganics or purely organics, accounting for the fact that the latter compounds are at about several millions, the concepts of the chemical bonding is chiefly understood in the classical concepts of organics; or inorganics treating purely ionic interactions. In fact there are scarce efforts in understanding of the chemical reactivity of metal-organics, nevertheless that there is tremendous studies devoted to organometallic catalyzing agents including ZnII-containing catalyzing processes, showing different chemical reactivity across the chemical classes of organics with not so different molecular scaffolds, however. So, when the behavior of the metal ion is different towards close as dentate character and centers ligands, this means that the d-orbitals are involved in bonding, which as mentioned above has different character. Moreover it is changed even within the framework of one and the same type bonding, like Zn-Cl for example, which presumably is ionic (and it is ionic but in ZnCl42-), however depending on the type of other ligands in the inner coordination sphere of the chromophore ZnClxYz the nature of the Zn-Cl is changed.

Or, the answer to your question is: yes, they do!

Dear Ajmal

please write me your email,  I tried to send the book here but I could not be successful

, I will send it by email.

Best wishes

@Parisa, I am also interested in reading the book. Can you also send the same to me pls- [email protected]

Thank you Dear Parisa Ziarati,

My email is [email protected]

 Dear Mam Bojidarka B. Ivanova,

Thanks for your valuable answer. I want to ask that how does crystal field theory apply for such systems? As d orbitals are filled so how they interact with ligands according to crystal field theory? 

Dear Dr Ajmal and Dear Dr Beenish

I have sent the book, my e-mail address is : [email protected].

Best wishes

Parisa Ziarati

Dear Parisa Ziarati ,

Thank you so much for book. 

With Best Regards

Beenish Ajmal

welcome dear!

best regards