What is the journal entry for issue of debentures as collateral security?

Debenture Suspense A/c Dr
    To Debentures A/c
(Issue of debentures as collateral security)

For issue of debentures as collateral security debenture suspense account will be debited and debentures account will be credited.

Debenture Suspense A/c Dr: This part of the entry represents a debit to the "Debenture Suspense Account." When debentures are issued as collateral security, it's common to temporarily place the debentures in a suspense account until the specific terms of the collateral arrangement are met or until the collateral is released.
Debentures A/c: This part of the entry represents a credit to the "Debentures Account." It acknowledges the issuance of debentures as collateral security. The value credited should be equal to the face value or book value of the debentures being issued.