Related literature {#sec1}
==================

For isostructural \[*M*(C~2~H~8~N~2~)~3~\]SO~4~ complexes, see: Haque *et al.* ( 1970[@bb6]); Cullen & Lingafelter (1970[@bb3]); Daniels *et al.* ( 1995[@bb4]); Lu (2009[@bb7]) for the nickel, copper, vanadium and manganese analogues, respectively. 

Experimental {#sec2}
============

 {#sec2.1}

### Crystal data {#sec2.1.1}

\[Co(C~2~H~8~N~2~)~3~\]SO~4~*M* *~r~* = 335.30Trigonal,*a* = 8.9920 (2) Å*c* = 9.5927 (3) Å*V* = 671.71 (3) Å^3^*Z* = 2Mo *K*α radiationμ = 1.45 mm^−1^*T* = 298 K0.48 × 0.22 × 0.20 mm

### Data collection {#sec2.1.2}

Bruker SMART CCD area-detector diffractometerAbsorption correction: multi-scan (*SADABS*; Sheldrick, 1996[@bb8]) *T* ~min~ = 0.543, *T* ~max~ = 0.7603638 measured reflections688 independent reflections589 reflections with *I* \> 2σ(*I*)*R* ~int~ = 0.027

### Refinement {#sec2.1.3}

*R*\[*F* ^2^ \> 2σ(*F* ^2^)\] = 0.028*wR*(*F* ^2^) = 0.069*S* = 1.06688 reflections47 parameters16 restraintsH-atom parameters constrainedΔρ~max~ = 0.25 e Å^−3^Δρ~min~ = −0.29 e Å^−3^

 {#d5e577}

Data collection: *SMART* (Bruker, 2003[@bb2]); cell refinement: *SAINT* (Bruker, 2003[@bb2]); data reduction: *SAINT*; program(s) used to solve structure: *SHELXS97* (Sheldrick, 2008[@bb9]) and *WinGX* (Farrugia, 1999[@bb5]); program(s) used to refine structure: *SHELXL97* (Sheldrick, 2008[@bb9]) and *WinGX* (Farrugia, 1999[@bb5]); molecular graphics: *DIAMOND* (Brandenburg, 2006[@bb1]); software used to prepare material for publication: *publCIF* (Westrip, 2010[@bb10]). 

Supplementary Material
======================

Crystal structure: contains datablocks I, global.  DOI: [10.1107/S1600536810016168/tk2667sup1.cif](http://dx.doi.org/10.1107/S1600536810016168/tk2667sup1.cif)

Structure factors: contains datablocks I. DOI: [10.1107/S1600536810016168/tk2667Isup2.hkl](http://dx.doi.org/10.1107/S1600536810016168/tk2667Isup2.hkl)

Additional supplementary materials: [crystallographic information](http://scripts.iucr.org/cgi-bin/sendsupfiles?tk2667&file=tk2667sup0.html&mime=text/html); [3D view](http://scripts.iucr.org/cgi-bin/sendcif?tk2667sup1&Qmime=cif); [checkCIF report](http://scripts.iucr.org/cgi-bin/paper?tk2667&checkcif=yes)

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: [TK2667](http://scripts.iucr.org/cgi-bin/sendsup?tk2667)). 

This work was supported financially by the Thailand Research Fund and the Center of Excellence for Innovation in Chemistry.  BY thanks the Royal Golden Jubilee PhD program and the Graduate School of Chiang Mai University for a graduate scholarship. 

Comment
=======

The title complex, \[Co^II^(C~2~H~8~N~2~)~3~\]SO~4~ (Fig.  1), is isostructural to the earlier reported \[Ni^II^(C~2~H~8~N~2~)~3~\]SO~4~ (Haque *et al.*,,  1970), \[V^II^(C~2~H~8~N~2~)~3~\]SO~4~ (Daniels *et al.*,  1995), \[Mn^II^(C~2~H~8~N~2~)~3~\]SO~4~ (Lu, 2009) and \[Cu^II^(C~2~H~8~N~2~)~3~\]SO~4~ (Cullen & Lingafelter, 1970) complexes, constituting the \[M^II^(C~2~H~2~N~2~)~3~\]SO~4~ series.  The \[M^II^(C~2~H~2~N~2~)~3~\]SO~4~ structures crystallize in the same trigonal space group of P31c with quite similar cell parameters.  Likewise, the metal and sulfur atoms are positioned in the same crystallographic sites; M^II^ on the 2*d* and S on the 2*c*Wyckoff sites (each with point symmetry 32).  The disorder about the six-fold rotation axis found in the sulfate anion is intriguingly common in each structure, although the number of unique O atoms varies from two to four.  In the structure of \[Co^II^(C~2~H~8~N~2~)~3~\]SO~4~, the O atoms were refined as being disordered over three crystallographic sites, although the site occupancy of O3 located on the 4*f*Wyckoff site approaches zero.  The bond length associated with this O3 atom (S1---O3; 1.382 (16) Å) is notably shorter than the other S---O bonds (1.431 (5)--1.445 (5) Å).  The disordered sulfate anions are linked to the \[Co^II^(C~2~H~8~N~2~)~3~\]^2+^ cations by hydrogen bonding interactions of N---H···O type to form a hydrogen-bonding supramolecular network.  The hydrogen bonding geometries are consistent with those of the previously reported \[M^II^(C~2~H~2~N~2~)~3~\]SO~4~ complexes. 

Experimental {#experimental}
============

Orange blocks of the title complex were synthesized and grown from the sovolthermal reaction of Co(NO~3~)~2~.6H~2~O (1.34 mmol), NH~2~SO~3~H (1.34 mmol), NH~2~C~2~H~4~NH~2~ (3.89 mmol) in ethylene glycol (160 mmol), conducted at 453 K for 72 h.

Refinement {#refinement}
==========

The O atoms were positioned from a difference Fourier map, and refined with restraints using commands SUMP, SADI and SIMU in *SHELXL* (Sheldrick, 2008).  Although there was an indication for further splitting of the O2 atom, after the final cycles of refinement, such action did not give a better result.  All H-atoms were treated as riding groups on the bonded atoms, with C---H = 0.97 Å and N---H 0.90 Å, and with U~iso~(H) = 1.2U~equiv~(C, N). 

Figures
=======

![ View of the title complex showing atom numbering scheme.  Displacement ellipsoids for non-H atoms are drawn at the 50% probability level.  \[Symmetry codes: (i) -y+1, x-y, z; (ii) -x+y+1, -x+1, z; (iii) -y+1, -x+1, -z+1/2; (iv) -x+y+1, y, -z+1/2; (v) x, x-y, -z+1/2; (vi) -y+1, x-y+1, z, (vii) -x+y, -x+1, z; (viii) -x+y, y, -z+1/2; (ix) x, x-y+1, -z+1/2\].  Hydrogen atoms are omitted.](e-66-0m628-fig1){#Fap1}

![ View of the hydrogen bonding interactions (dotted lines) between the disordered sulfate O atoms and the amino-H atoms of the \[CoII(C2H8N2)\]2+ cations.  \[Symmetry codes: (ii) -x+y+1, -x+1, z; (iii) -y+1, -x+1, -z+1/2; (viii) -x+y, y, -z+1/2; (ix) x, x-y+1, -z+1/2; (xiii) y, x, z+1/2; (xiv) -y+x, -y+1, -z+1/2; (xv) -x+1, -x+y+1, z+1/2\].](e-66-0m628-fig2){#Fap2}

Crystal data {#tablewrapcrystaldatalong}
============

  ------------------------------ --------------------------------------
  \[Co(C~2~H~8~N~2~)~3~\]SO~4~   *D*~x~ = 1.658 Mg m^−3^
  *M~r~* = 335.30                Mo *K*α radiation, λ = 0.71073 Å
  Trigonal, *P*31*c*             Cell parameters from 589 reflections
  Hall symbol: -P 3 2c           θ = 2.6--31.0°
  *a* = 8.9920 (2) Å             µ = 1.45 mm^−1^
  *c* = 9.5927 (3) Å             *T* = 298 K
  *V* = 671.71 (3) Å^3^          Block, orange
  *Z* = 2                        0.48 × 0.22 × 0.20 mm
  *F*(000) = 354                 
  ------------------------------ --------------------------------------

Data collection {#tablewrapdatacollectionlong}
===============

  --------------------------------------------------------------- -------------------------------------
  Bruker SMART CCD area-detector diffractometer                   688 independent reflections
  Radiation source: fine-focus sealed tube                        589 reflections with *I* \> 2σ(*I*)
  graphite                                                        *R*~int~ = 0.027
  ?  scan                                                          θ~max~ = 31.0°, θ~min~ = 2.6°
  Absorption correction: multi-scan (*SADABS*; Sheldrick, 1996)   *h* = −8→10
  *T*~min~ = 0.543, *T*~max~ = 0.760                              *k* = −11→11
  3638 measured reflections                                       *l* = −11→13
  --------------------------------------------------------------- -------------------------------------

Refinement {#tablewraprefinementdatalong}
==========

  ------------------------------------- -------------------------------------------------------------------------------------------------
  Refinement on *F*^2^                  Primary atom site location: structure-invariant direct methods
  Least-squares matrix: full            Secondary atom site location: difference Fourier map
  *R*\[*F*^2^ \> 2σ(*F*^2^)\] = 0.028   Hydrogen site location: inferred from neighbouring sites
  *wR*(*F*^2^) = 0.069                  H-atom parameters constrained
  *S* = 1.06                            *w* = 1/\[σ^2^(*F*~o~^2^) + (0.0354*P*)^2^ + 0.1217*P*\] where *P* = (*F*~o~^2^ + 2*F*~c~^2^)/3
  688 reflections                       (Δ/σ)~max~ \< 0.001
  47 parameters                         Δρ~max~ = 0.25 e Å^−3^
  16 restraints                         Δρ~min~ = −0.29 e Å^−3^
  ------------------------------------- -------------------------------------------------------------------------------------------------

Special details {#specialdetails}
===============

  -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  Geometry.  All esds (except the esd in the dihedral angle between two l.s.  planes) are estimated using the full covariance matrix.  The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry.  An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s.  planes. 
  Refinement.  Refinement of *F*^2^ against ALL reflections.  The weighted *R*-factor wR and goodness of fit *S* are based on *F*^2^, conventional *R*-factors *R* are based on *F*, with *F* set to zero for negative *F*^2^. The threshold expression of *F*^2^ \> σ(*F*^2^) is used only for calculating *R*-factors(gt) etc.  and is not relevant to the choice of reflections for refinement. * R*-factors based on *F*^2^ are statistically about twice as large as those based on *F*, and *R*- factors based on ALL data will be even larger. 
  -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å^2^) {#tablewrapcoords}
==================================================================================================

  ----- -------------- -------------- -------------- -------------------- ------------
        *x*            *y*            *z*            *U*~iso~\*/*U*~eq~   Occ. ( \<1)
  Co1   0.6667         0.3333         0.2500         0.02175 (16)         
  N1    0.68784 (18)   0.54599 (18)   0.12760 (13)   0.0332 (3)           
  H1A   0.6936         0.5265         0.0363         0.040\*              
  H1B   0.5954         0.5579         0.1418         0.040\*              
  S1    0.3333         0.6667         0.2500         0.0240 (2)           
  C1    0.8446 (2)     0.7024 (2)     0.17145 (19)   0.0388 (4)           
  H1C   0.8405         0.8031         0.1409         0.047\*              
  H1D   0.9444         0.7056         0.1297         0.047\*              
  O1    0.3029 (19)    0.5088 (9)     0.1852 (8)     0.096 (3)            0.319 (8)
  O2    0.339 (2)      0.7851 (9)     0.1475 (6)     0.096 (4)            0.316 (9)
  O3    0.3333         0.6667         0.1059 (16)    0.086 (8)            0.094 (10)
  ----- -------------- -------------- -------------- -------------------- ------------

Atomic displacement parameters (Å^2^) {#tablewrapadps}
=====================================

  ----- ------------- ------------ ------------ -------------- ------------- ------------
        *U*^11^       *U*^22^      *U*^33^      *U*^12^        *U*^13^       *U*^23^
  Co1   0.0226 (2)    0.0226 (2)   0.0201 (2)   0.01129 (10)   0.000         0.000
  N1    0.0410 (8)    0.0330 (7)   0.0283 (7)   0.0204 (6)     −0.0033 (5)   0.0031 (5)
  S1    0.0243 (3)    0.0243 (3)   0.0233 (4)   0.01215 (14)   0.000         0.000
  C1    0.0445 (10)   0.0267 (8)   0.0413 (9)   0.0147 (7)     0.0058 (7)    0.0076 (6)
  O1    0.185 (9)     0.051 (4)    0.063 (4)    0.069 (5)      −0.012 (5)    −0.016 (3)
  O2    0.194 (12)    0.055 (4)    0.044 (3)    0.067 (5)      −0.012 (4)    0.012 (3)
  O3    0.118 (11)    0.118 (11)   0.021 (11)   0.059 (5)      0.000         0.000
  ----- ------------- ------------ ------------ -------------- ------------- ------------

Geometric parameters (Å, °) {#tablewrapgeomlong}
===========================

  ------------------------- ------------- -------------------------- -------------
  Co1---N1^i^               2.1696 (13)   S1---O2^vi^                1.431 (5)
  Co1---N1^ii^              2.1696 (13)   S1---O2^v^                 1.431 (5)
  Co1---N1^iii^             2.1696 (13)   S1---O2^vii^               1.431 (5)
  Co1---N1^iv^              2.1696 (13)   S1---O2^viii^              1.431 (5)
  Co1---N1                  2.1696 (13)   S1---O2^ix^                1.431 (5)
  Co1---N1^v^               2.1696 (13)   S1---O1^ix^                1.445 (5)
  N1---C1                   1.469 (2)     S1---O1^viii^              1.445 (5)
  N1---H1A                  0.9000        S1---O1^vi^                1.445 (5)
  N1---H1B                  0.9000        S1---O1^vii^               1.445 (5)
  S1---O3                   1.382 (16)    C1---C1^iv^                1.512 (4)
  S1---O3^v^                1.382 (16)    C1---H1C                   0.9700
  S1---O2                   1.431 (5)     C1---H1D                   0.9700
                                                                     
  N1^i^---Co1---N1^ii^      80.49 (7)     O2^viii^---S1---O1^viii^   110.7 (4)
  N1^i^---Co1---N1^iii^     93.48 (5)     O2^ix^---S1---O1^viii^     138.0 (11)
  N1^ii^---Co1---N1^iii^    93.17 (8)     O1^ix^---S1---O1^viii^     63.4 (8)
  N1^i^---Co1---N1^iv^      93.17 (8)     O3---S1---O1^vi^           64.5 (3)
  N1^ii^---Co1---N1^iv^     93.48 (5)     O3^v^---S1---O1^vi^        115.5 (3)
  N1^iii^---Co1---N1^iv^    171.28 (7)    O2---S1---O1^vi^           57.2 (5)
  N1^i^---Co1---N1          93.48 (5)     O2^vi^---S1---O1^vi^       110.7 (4)
  N1^ii^---Co1---N1         171.28 (8)    O2^v^---S1---O1^vi^        138.0 (11)
  N1^iii^---Co1---N1        93.48 (5)     O2^vii^---S1---O1^vi^      69.9 (6)
  N1^iv^---Co1---N1         80.49 (7)     O2^viii^---S1---O1^vi^     45.7 (4)
  N1^i^---Co1---N1^v^       171.28 (8)    O2^ix^---S1---O1^vi^       119.2 (10)
  N1^ii^---Co1---N1^v^      93.48 (5)     O1^ix^---S1---O1^vi^       93.3 (11)
  N1^iii^---Co1---N1^v^     80.49 (7)     O1^viii^---S1---O1^vi^     102.9 (4)
  N1^iv^---Co1---N1^v^      93.48 (5)     O3---S1---O1^vii^          115.5 (3)
  N1---Co1---N1^v^          93.17 (8)     O3^v^---S1---O1^vii^       64.5 (3)
  C1---N1---Co1             107.94 (10)   O2---S1---O1^vii^          138.0 (11)
  C1---N1---H1A             110.1         O2^vi^---S1---O1^vii^      69.9 (6)
  Co1---N1---H1A            110.1         O2^v^---S1---O1^vii^       57.2 (5)
  C1---N1---H1B             110.1         O2^vii^---S1---O1^vii^     110.7 (4)
  Co1---N1---H1B            110.1         O2^viii^---S1---O1^vii^    119.2 (10)
  H1A---N1---H1B            108.4         O2^ix^---S1---O1^vii^      45.7 (4)
  O3---S1---O3^v^           180.000 (3)   O1^ix^---S1---O1^vii^      102.9 (4)
  O3---S1---O2              46.6 (3)      O1^viii^---S1---O1^vii^    93.3 (11)
  O3^v^---S1---O2           133.4 (3)     O1^vi^---S1---O1^vii^      161.1 (12)
  O3---S1---O2^vi^          46.6 (3)      N1---C1---C1^iv^           108.84 (12)
  O3^v^---S1---O2^vi^       133.4 (3)     N1---C1---H1C              109.9
  O2---S1---O2^vi^          78.0 (5)      C1^iv^---C1---H1C          109.9
  O3---S1---O2^v^           133.4 (3)     N1---C1---H1D              109.9
  O3^v^---S1---O2^v^        46.6 (3)      C1^iv^---C1---H1D          109.9
  O2---S1---O2^v^           104.4 (11)    H1C---C1---H1D             108.3
  O2^vi^---S1---O2^v^       99.7 (7)      O2^vi^---O1---O2^viii^     91.9 (8)
  O3---S1---O2^vii^         133.4 (3)     O2^vi^---O1---S1           66.5 (5)
  O3^v^---S1---O2^vii^      46.6 (3)      O2^viii^---O1---S1         60.9 (3)
  O2---S1---O2^vii^         99.7 (7)      O2^vi^---O1---O1^vii^      75.7 (11)
  O2^vi^---S1---O2^vii^     176.3 (13)    O2^viii^---O1---O1^vii^    117.8 (4)
  O2^v^---S1---O2^vii^      78.0 (5)      S1---O1---O1^vii^          58.3 (4)
  O3---S1---O2^viii^        46.6 (3)      O2^vi^---O1---O2^ix^       108.3 (7)
  O3^v^---S1---O2^viii^     133.4 (3)     O2^viii^---O1---O2^ix^     92.2 (8)
  O2---S1---O2^viii^        78.0 (5)      S1---O1---O2^ix^           54.6 (4)
  O2^vi^---S1---O2^viii^    78.0 (5)      O1^viii^---O2---O1^vi^     129.8 (7)
  O2^v^---S1---O2^viii^     176.3 (13)    O1^viii^---O2---S1         67.8 (4)
  O2^vii^---S1---O2^viii^   104.4 (11)    O1^vi^---O2---S1           61.9 (4)
  O3---S1---O2^ix^          133.4 (3)     O1^viii^---O2---O1^ix^     63.3 (12)
  O3^v^---S1---O2^ix^       46.6 (3)      O1^vi^---O2---O1^ix^       87.5 (9)
  O2---S1---O2^ix^          176.3 (13)    S1---O2---O1^ix^           55.5 (3)
  O2^vi^---S1---O2^ix^      104.4 (11)    O1^viii^---O2---O2^vi^     49.8 (6)
  O2^v^---S1---O2^ix^       78.0 (5)      O1^vi^---O2---O2^vi^       95.3 (5)
  O2^vii^---S1---O2^ix^     78.0 (5)      S1---O2---O2^vi^           51.0 (2)
  O2^viii^---S1---O2^ix^    99.7 (7)      O1^ix^---O2---O2^vi^       91.9 (8)
  O3---S1---O1^ix^          115.5 (3)     O1^viii^---O2---O2^viii^   106.1 (5)
  O3^v^---S1---O1^ix^       64.5 (3)      S1---O2---O2^viii^         51.0 (2)
  O2---S1---O1^ix^          69.9 (6)      O1^ix^---O2---O2^viii^     102.2 (4)
  O2^vi^---S1---O1^ix^      119.2 (10)    O2^vi^---O2---O2^viii^     60.000 (1)
  O2^v^---S1---O1^ix^       45.7 (4)      O2^vi^---O3---O2^viii^     107.9 (8)
  O2^vii^---S1---O1^ix^     57.2 (5)      O2^vi^---O3---S1           69.0 (8)
  O2^viii^---S1---O1^ix^    138.0 (11)    O2^viii^---O3---S1         69.0 (8)
  O2^ix^---S1---O1^ix^      110.7 (4)     O2^vi^---O3---O1^viii^     61.1 (6)
  O3---S1---O1^viii^        64.5 (3)      O2^viii^---O3---O1^viii^   128.2 (13)
  O3^v^---S1---O1^viii^     115.5 (3)     S1---O3---O1^viii^         59.8 (5)
  O2---S1---O1^viii^        45.7 (4)      O2^vi^---O3---O1^vi^       128.2 (13)
  O2^vi^---S1---O1^viii^    57.2 (5)      O2^viii^---O3---O1^vi^     47.4 (6)
  O2^v^---S1---O1^viii^     69.9 (6)      S1---O3---O1^vi^           59.8 (5)
  O2^vii^---S1---O1^viii^   119.2 (10)    O1^viii^---O3---O1^vi^     96.9 (7)
  ------------------------- ------------- -------------------------- -------------

Symmetry codes: (i) −*x*+*y*+1, −*x*+1, *z*; (ii) *x*, *x*−*y*, −*z*+1/2; (iii) −*y*+1, *x*−*y*, *z*; (iv) −*x*+*y*+1, *y*, −*z*+1/2; (v) −*y*+1, −*x*+1, −*z*+1/2; (vi) −*y*+1, *x*−*y*+1, *z*; (vii) −*x*+*y*, *y*, −*z*+1/2; (viii) −*x*+*y*, −*x*+1, *z*; (ix) *x*, *x*−*y*+1, −*z*+1/2. 

Hydrogen-bond geometry (Å, °) {#tablewraphbondslong}
=============================

  --------------------- --------- --------- ------------ ---------------
  *D*---H···*A*         *D*---H   H···*A*   *D*···*A*    *D*---H···*A*
  N1---H1A···O3^x^      0.90      2.13      2.889 (12)   142
  N1---H1A···O1^x^      0.90      2.15      3.049 (7)    176
  N1---H1A···O2^xi^     0.90      2.22      3.054 (8)    155
  N1---H1A···O2^xii^    0.90      2.32      3.104 (11)   145
  N1---H1B···O2^viii^   0.90      1.98      2.843 (6)    161
  N1---H1B···O1         0.90      2.48      3.353 (14)   165
  N1---H1B···O1^v^      0.90      2.52      3.256 (10)   139
  --------------------- --------- --------- ------------ ---------------

Symmetry codes: (x) −*x*+1, −*y*+1, −*z*; (xi) *y*, −*x*+*y*, −*z*; (xii) *x*−*y*+1, *x*, −*z*; (viii) −*x*+*y*, −*x*+1, *z*; (v) −*y*+1, −*x*+1, −*z*+1/2. 

###### Hydrogen-bond geometry (Å, °)

  *D*---H⋯*A*          *D*---H   H⋯*A*   *D*⋯*A*      *D*---H⋯*A*
  -------------------- --------- ------- ------------ -------------
  N1---H1*A*⋯O3^i^     0.90      2.13    2.889 (12)   142
  N1---H1*A*⋯O1^i^     0.90      2.15    3.049 (7)    176
  N1---H1*A*⋯O2^ii^    0.90      2.22    3.054 (8)    155
  N1---H1*A*⋯O2^iii^   0.90      2.32    3.104 (11)   145
  N1---H1*B*⋯O2^iv^    0.90      1.98    2.843 (6)    161
  N1---H1*B*⋯O1        0.90      2.48    3.353 (14)   165
  N1---H1*B*⋯O1^v^     0.90      2.52    3.256 (10)   139

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) ; (v) .