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We report experimental results of the static magnetization, ESR and NMRspectroscopic measurements of the Ni-hybrid compoundNiCl$_3$C$_6$H$_5$CH$_2$CH$_2$NH$_3$. In this material NiCl$_3$ octahedra arestructurally arranged in chains along the crystallographic $a$-axis. Accordingto the static susceptibility and ESR data Ni$^{2+}$ spins $S = 1$ are isotropicand are coupled antiferromagnetically (AFM) along the chain with the exchangeconstant $J = 25.5$ K. These are important prerequisites for the realization ofthe so-called Haldane spin-1 chain with the spin-singlet ground state and aquantum spin gap. However, experimental results evidence AFM order at $T_{\rmN} \approx 10$ K presumably due to small interchain couplings. Interestingly,frequency-, magnetic field-, and temperature-dependent ESR measurements, aswell as the NMR data, reveal signatures which could presumably indicate aninhomogeneous ground state of co-existent mesoscopically spatially separatedAFM ordered and spin-singlet state regions similar to the situation observedbefore in some spin-diluted Haldane magnets.

Magnetic properties of the spin-1 chain compound NiCl$_3$C$_6$H$_5$CH$_2$CH$_2$NH$_3$