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This paper reports on an unmodeled, all-sky search for gravitational wavesfrom merging intermediate mass black hole binaries (IMBHB). The search wasperformed on data from the second joint science run of the LIGO and Virgodetectors (July 2009 - October 2010) and was sensitive to IMBHBs with a rangeup to $\sim 200$ Mpc, averaged over the possible sky positions and inclinationsof the binaries with respect to the line of sight. No significant candidate wasfound. Upper limits on the coalescence-rate density of nonspinning IMBHBs withtotal masses between 100 and $450 \ \mbox{M}_{\odot}$ and mass ratios between$0.25$ and $1\,$ were placed by combining this analysis with an analogoussearch performed on data from the first LIGO-Virgo joint science run (November2005 - October 2007). The most stringent limit was set for systems consistingof two $88 \ \mbox{M}_{\odot}$ black holes and is equal to $0.12 \\mbox{Mpc}^{-3} \ \mbox{Myr}^{-1}$ at the $90\%$ confidence level. This paperalso presents the first estimate, for the case of an unmodeled analysis, of theimpact on the search range of IMBHB spin configurations: the visible volume forIMBHBs with nonspinning components is roughly doubled for a population ofIMBHBs with spins aligned with the binary's orbital angular momentum anduniformly distributed in the dimensionless spin parameter up to 0.8, whereas ananalogous population with antialigned spins decreases the visible volume by$\sim 20\%\,$.

Search for gravitational radiation from intermediate mass black hole binaries in data from the second LIGO-Virgo joint science run