To supplement information from Google provided by Dick, a search of the
Corpus of Contemporary American English shows that the string "concerned
to" appears 226 times in the corpus, the overwhelming number of those
occurrences (129) are in academic writing.

Examples:
Kohl was particularly concerned to ensure that Poland was integrated into
NATO and the EU.

Like Gerson and Vitoria, Lessius is concerned to situate the pursuit of
health through food within an appropriate spiritual context.

In examples like these, I discern a slight difference between the meaning
of "concerned to" and the meaning that would be given by "concerned with."
 "With" is used when the following phrase in the sentence names a topic 
which absorbs one's attention. "To" is followed by an action to be done as
a result of one's concern.

R. Michael Medley, Ph.D.
Professor of English
Eastern Mennonite University

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