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The main idea is to prepare string with the list of files to operate (even through the loop) than transfer the string to command:

sloc='[email protected]:/some/location/'
flist=( $(for i in "$@" ; do printf '%s ' "$sloc$i/$i".{pdf,txt} ; done ) )
scp "${flist[@]}" /somewhere/else/

The main idea is to prepare string with the list of files to operate (even through the loop) than transfer the string to command:

sloc='/some/location'
unset flist
for i in "$@" 
do 
    flist[${#flist[*]}]="$sloc/$i/$i".pdf 
    flist[${#flist[*]}]="$sloc/$i/$i".txt
done
scp [email protected]:"${flist[@]}" /somewhere/else/

The main idea is to prepare string with the list of files to operate (even through the loop) than transfer the string to command:

sloc='[email protected]:/some/location/'
flist=( $(for i in "$@" ; do printf '"%s" ' "$sloc$i/$i".{pdf,txt} ; done ) )
scp ${flist[*]} /somewhere/else/

The main idea is to prepare string with the list of files to operate (even through the loop) than transfer the string to command:

sloc='[email protected]:/some/location/'
flist=( $(for i in "$@" ; do printf '%s ' "$sloc$i/$i".{pdf,txt} ; done ) )
scp "${flist[@]}" /somewhere/else/

The main idea is to prepare string with the list of files to operate (even through the loop) than transfer the string to command:

sloc='/some/location/'
flist=( $(for i in "$@" ; do printf '"%s" ' "$sloc$i/$i".{pdf,txt} ; done ) )
scp [email protected]:${flist[*]} /somewhere/else/

The main idea is to prepare string with the list of files to operate (even through the loop) than transfer the string to command:

sloc='[email protected]:/some/location/'
flist=( $(for i in "$@" ; do printf '"%s" ' "$sloc$i/$i".{pdf,txt} ; done ) )
scp ${flist[*]} /somewhere/else/