List empty OU's

i’m using below query to list empty OU’s fom AD. but its not working :(

could some one help me ?

Get-ADObject -Filter {objectclass -eq “OrganizationalUnit”} | Where-Object {@(get-adobject -Filter * -SearchBase $_.DistinguishedName).count -eq 1} | Out-File d:\ou.txt

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Regards, Nidhin.CK