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Small single crystals of Rb$_3$Ni$_2$(NO$_3$)$_7$ were obtained bycrystallization from anhydrous nitric acid solution of rubidium nitrate andnickel nitrate hexahydrate. The basic elements of the crystal structure of thisnew compound are isolated spin-1 two-leg ladders of Ni$^{2+}$-ions connected by(NO$_3$)$^-$ groups. The experimental data show the absence of long rangemagnetic order at T $\geq 2$~K. LDA+U calculations and the detailed analysis ofthe experimental data, i.e. of the magnetic susceptibility, the specific heatin magnetic fields up to 9~T, the magnetization, and of the high-frequencyelectron spin resonance data, enable quantitative estimates of the relevantparameters of the $S=1$ ladders in Rb$_3$Ni$_2$(NO$_3$)$_7$ . The rung-coupling$J_1 = 10.5$~K, the leg-coupling $J_2=1.6$~K, and the uniaxial anisotropy $|A|= 179$~GHz are obtained. The scenario of spin liquid quantum ground state isfurther corroborated by quantum Monte Carlo simulations of the magneticsusceptibility.

Electronic structure and magnetic properties of the strong-rung spin-1 ladder compound Rb$_3$Ni$_2$(NO$_3$)$_7$