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Single crystalline and polycrystalline samples of $S=1/2$ Kagom\'{e} lattices{[Cu$_{3}$(CO$_{3}$)$_{2}$$(bpe)_{3}$](ClO$_{4}$)$_2$}$_{n}$ and{[Cu$_{3}$(CO$_{3}$)$_{2}$$(bpy)_{3}$](ClO$_{4}$)$_2$}$_{n}$, respectively weresynthesized. Their structural and magnetic properties were characterized bymeans of x-ray diffraction and magnetization measurements. Both compoundscrystalize in a hexagonal structure (space group $P-6$) consisting of CuO$_4$Kagom\'{e} layers in the $ab$-plane but linked along $c$ direction througheither rigid $bpy$ or flexible $bpe$ ligands to form 3D frame works. Magneticmeasurements reveal that both the compounds undergo ferromagnetic ordering($T_{\rm C}$) at low temperatures and the $T_{\rm C}$ and the extent offrustration could be tuned by changing the nature of the pillar ligands.{[Cu$_{3}$(CO$_{3}$)$_{2}$$(bpe)_{3}$](ClO$_{4}$)$_2$}$_{n}$ which is made upof flexible $bpe$ ligands has a $T_{\rm C}$ of 5.7 K and a Curie-Weisstemperature ($\theta_{\rm CW}$) of -39.7 K giving rise to a frustrationparameter of $\frac{|\theta_{\rm CW}|}{T_{\rm C}} \simeq$ 6.96. But thereplacement of $bpe$ by a more rigid and electronically delocalized $bpy$ligand leads to an enhanced $T_{\rm C} \simeq$ 9.3 K and a reduced frustrationparameter of $\frac{|\theta_{\rm CW}|}{T_{\rm C}} \simeq$ 3.54.

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Tuning of magnetic frustration in $S=1/2$ Kagom\'{e} lattices  {[Cu$_{3}$(CO$_{3}$)$_{2}$$(bpe)_{3}$](ClO$_{4}$)$_2$}$_{n}$ and  {[Cu$_{3}$(CO$_{3}$)$_{2}$$(bpy)_{3}$](ClO$_{4}$)$_2$}$_{n}$ through rigid  and flexible ligands