The behavior of potassium follows that of calcium in heterobimetallic 'K-H-Al' hydrides on a picolyl-derived chemically non-innocent triaza ligand.
Mandal, Chhotan; Kundu, Abhishek; Panda, Sourav; Mukherjee, Debabrata; Dalton transactions (Cambridge, England : 2003) 55 (2026) 3934–3942; doi:10.1039/d6dt00079g

data_7720148
_publ_section_title
;
 The behavior of potassium follows that of calcium in heterobimetallic
 'K-H-Al' hydrides on a picolyl-derived chemically non-innocent triaza
 ligand.
;
_journal_issue                   9
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              3934
_journal_page_last               3942
_journal_paper_doi               10.1039/d6dt00079g
_journal_volume                  55
_journal_year                    2026
_chemical_formula_moiety         'C18 H26 Al N3'
_chemical_formula_sum            'C18 H26 Al N3'
_chemical_formula_weight         311.40
_space_group_crystal_system      monoclinic
_space_group_IT_number           15
_space_group_name_Hall           '-I 2ya'
_space_group_name_H-M_alt        'I 1 2/a 1'
_atom_sites_solution_hydrogens   mixed
_audit_creation_date             2025-08-18
_audit_creation_method
;
Olex2 1.5
(compiled 2024.02.16 svn.r378c4104 for OlexSys, GUI svn.r6928)
;
_audit_update_record
;
2025-08-21 deposited with the CCDC.	2026-02-03 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 99.3490(10)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   25.9955(3)
_cell_length_b                   6.52390(10)
_cell_length_c                   20.5807(2)
_cell_measurement_reflns_used    3136
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      68.106
_cell_measurement_theta_min      3.446
_cell_volume                     3443.96(7)
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL 2019/3 (Sheldrick, 2015)'
_computing_structure_solution    'SHELXT 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_temperature      100.15
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'XtaLAB Synergy, Dualflex, HyPix3000'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0200
_diffrn_reflns_av_unetI/netI     0.0110
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       29
_diffrn_reflns_limit_h_min       -31
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            17689
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         68.106
_diffrn_reflns_theta_min         3.446
_exptl_absorpt_coefficient_mu    1.016
_exptl_absorpt_correction_T_max  0.906
_exptl_absorpt_correction_T_min  0.839
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            'clear yellowish yellow'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   yellowish
_exptl_crystal_colour_primary    yellow
_exptl_crystal_density_diffrn    1.201
_exptl_crystal_description       'rect. Prism'
_exptl_crystal_F_000             1344
_exptl_crystal_preparation       'solvent diffusion'
_exptl_crystal_size_max          0.231
_exptl_crystal_size_mid          0.144
_exptl_crystal_size_min          0.097
_refine_diff_density_max         0.214
_refine_diff_density_min         -0.247
_refine_diff_density_rms         0.045
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.096
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     209
_refine_ls_number_reflns         3136
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.096
_refine_ls_R_factor_all          0.0359
_refine_ls_R_factor_gt           0.0353
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0367P)^2^+5.0323P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0914
_refine_ls_wR_factor_ref         0.0917
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3051
_reflns_number_total             3136
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d6dt00079g2.cif
_cod_data_source_block           cmal1_auto_cm01
_cod_depositor_comments
'Adding full bibliography for 7720145--7720151.cif.'
_cod_database_code               7720148
_shelx_shelxl_version_number     2019/3
_shelx_estimated_absorpt_t_max   0.908
_shelx_estimated_absorpt_t_min   0.799
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Secondary CH2 refined with riding coordinates:
 C12(H12A,H12B), C14(H14A,H14B), C17(H17A,H17B), C13(H13A,H13B), C15(H15A,H15B)
2.b Aromatic/amide H refined with riding coordinates:
 C8(H8), C11(H11), C9(H9), C4(H4), C7(H7), C2(H2), C10(H10), C3(H3)
2.c Idealised Me refined as rotating group:
 C18(H18A,H18B,H18C), C16(H16A,H16B,H16C)
;
_shelx_res_checksum              22316
_olex2_submission_special_instructions 'No special instructions were received'