LOSS OF SEPARATION BTWN A DH8 CLBING TO OR LEVEL AT 13000 FT AND A PA24 DSNDING FROM 14000 FT.

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ACFT #1 WAS A CLE DEP CLRED DIRECT YXU BY CLE APCH DUE TO A NEED TO ESTABLISH SOME FORM OF SEPARATION WITH ANOTHER DEP ALSO HANDED OFF TO ME. ACFT #1 WAS CLBED TO 17000 FT UPON CONTACT. CTLR AT ADJACENT SECTOR CALLED TO REQUEST ACFT #1 BE STOPPED IN CLB TO 13000 FT FOR ACFT #2; WHICH WAS BEING HANDED OFF TO ME LEVEL 14000 FT SEBOUND; LNDG 7G2 (AN ARPT IN CLOSE PROX). I COMPLIED WITH THE REQUEST; AMENDING ACFT #1'S CLB TO 13000 FT AND OBTAINED CTL FOR LOWER ON ACFT #2 RESPECT ACFT #1. ACFT #1 WAS CHANGED OVER TO ADJACENT SECTOR'S FREQ. I TURNED MY ATTN TO OTHER MATTERS AT HAND; INCLUDING ISSUING SPECIAL HOLDING INSTRUCTIONS TO PIT ARRS DUE TO ACO VOR OUTAGE. THE DATA BLOCK ON ACFT #1 WAS DROPPED BY ME DUE TO CLUTTER UPON LEAVING THE CONFINES OF MY AIRSPACE. LATER I DSNDED ACFT #2 TO 12000 FT WITHOUT AN APPROVED MEANS OF SEPARATION FROM ACFT #1. CONFLICT ALERT ACTIVATED WITH ACFT #2 INDICATING ALT OF 13200 FT AND LATERAL DISTANCE APPROX 3.9 MI AND INCREASING. NO EVASIVE ACTION WAS TAKEN UPON OBSERVING THAT SEPARATION WAS BEING RE-ESTABLISHED AND THAT SAFETY WAS NOT A FACTOR.