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While studying the Group 14 elements, I came across the anomalous behaviour of carbon. In that there was a point:
Carbon forms only p$\pi$-p$\pi$ type bonding while other elements in the group form p$\pi$-p$\pi$, as well as d$\pi$-p$\pi$ type bonding.
I am searching for molecules in which group 14 elements form d$\pi$-p$\pi$ bonds.
For $d\pi-p\pi$ bonding we need to consider other elements of group 14 except $\ce{C}$. (i.e, $\ce{Si, Ge ,Sn}$ etc.) which have got a vacant $d$ orbital of proper symmetry and energy to come into play bonding with attached group having lone pair of electron in p orbital of comparable energy.
For example $\ce{SiF4}$. $\ce{GeCl4}$ etc.
In tetrahedral geometry the orientation of vacant d orbital of the central atom (dxy. dyz,dxz) may overlap with filled p orbital of the ligating atom and hence $d\pi -p\pi$ bonding is possible.
