レコードをメール: Structures of dipotassium rubidium citrate monohydrate, K(2)RbC(6)H(5)O(7)(H(2)O), and potassium dirubidium citrate monohydrate, KRb(2)C(6)H(5)O(7)(H(2)O), from laboratory X-ray powder diffraction data and DFT calculations