what is the of Effect on $v(CO)$ of change in other ligands attached to metal

$\backslash$table$[[\backslash$table$[[$Oxidation State$],[$of metal$]],,],[[Mn(CO{)}_6{]}^{+},2090,],[[Mn(CO{)}_3$ dien ${]}^{+},2020,1900],[[Mn(CO{)}_3(P{F}_3{)}_3^{?}+),2109,2120]]$

Explanation:

dien $=$ Worse $$ acceptor than CO

$P{F}_3=$ Better $$ acceptor than CO

diethylenetriamine