Counter anion dependent gradual spin transition in a 1D cobalt(ii) coordination polymerElectronic supplementary information (ESI) available: Synthetic details, magnetic susceptibility measurements, X-ray crystallographic analyses, crystallographic data including bond distances, bond angles, non-covalent interaction parameters (Tables S1-S5), and structures (Fig. S1-S7) of 1·PF6RT and 1·PF6LT. CCDC 1006362 (1·PF6RT) and 1006363 (1·PF6LT). For ESI and crystallographic data in CIF or other electron

One Co( ii ) SCO coordination polymer [Co(enbzpy)(μ 1,5 -dca)] n (PF 6 ) n ( 1 ·PF 6 ) has been isolated and characterised structurally and magnetostructurally. The properties of 1 ·PF 6 are compared with the reported perchlorate analogue [Co(enbzpy)(μ 1,5 -dca)] n (ClO 4 ) n ( 1 ·ClO 4 ). The gradual spin transition in 1 ·PF 6 in contrast to an abrupt spin transition with a hysteresis loop in 1 ·ClO 4 has been analysed in terms of structural factors. One Co( ii ) SCO coordination polymer [Co(enbzpy)(μ 1,5 -dca)] n (PF 6 ) n ( 1 ·PF 6 ) has been isolated and characterised structurally and magnetostructurally. Contrasting magnetic behavior of 1 ·PF 6 in comparison to 1 ·ClO 4 has been analysed in terms of structural factors.