Remove the single quotes and put the brackets around the entire expression.
You cannot bind to function arguments, not in that way for sure.
Better yet, don't use binding:

<mx:LinkButton label="more" enabled="true"  themeColor="#FF2A00" >
    <mx:click>
        navigateToURL(new URLRequest(data.link));
    <mx:click/>
<mx:LinkButton/>

Something like this.

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